Number files like chapters. Consolidate toc & preface.

Aside from the consolidation of title & preface in index.md,
this commit was produced as follows:

```
cd spec/

g mv 03-lexical-syntax.md                      01-lexical-syntax.md
g mv 04-identifiers-names-and-scopes.md        02-identifiers-names-and-scopes.md
g mv 05-types.md                               03-types.md
g mv 06-basic-declarations-and-definitions.md  04-basic-declarations-and-definitions.md
g mv 07-classes-and-objects.md                 05-classes-and-objects.md
g mv 08-expressions.md                         06-expressions.md
g mv 09-implicit-parameters-and-views.md       07-implicit-parameters-and-views.md
g mv 10-pattern-matching.md                    08-pattern-matching.md
g mv 11-top-level-definitions.md               09-top-level-definitions.md
g mv 12-xml-expressions-and-patterns.md        10-xml-expressions-and-patterns.md
g mv 13-user-defined-annotations.md            11-user-defined-annotations.md
g mv 14-the-scala-standard-library.md          12-the-scala-standard-library.md
g mv 15-syntax-summary.md                      13-syntax-summary.md
g mv 16-references.md                          14-references.md

perl -pi -e 's/03-lexical-syntax/01-lexical-syntax/g' *.md
perl -pi -e 's/04-identifiers-names-and-scopes/02-identifiers-names-and-scopes/g' *.md
perl -pi -e 's/05-types/03-types/g' *.md
perl -pi -e 's/06-basic-declarations-and-definitions/04-basic-declarations-and-definitions/g' *.md
perl -pi -e 's/07-classes-and-objects/05-classes-and-objects/g' *.md
perl -pi -e 's/08-expressions/06-expressions/g' *.md
perl -pi -e 's/09-implicit-parameters-and-views/07-implicit-parameters-and-views/g' *.md
perl -pi -e 's/10-pattern-matching/08-pattern-matching/g' *.md
perl -pi -e 's/11-top-level-definitions/09-top-level-definitions/g' *.md
perl -pi -e 's/12-xml-expressions-and-patterns/10-xml-expressions-and-patterns/g' *.md
perl -pi -e 's/13-user-defined-annotations/11-user-defined-annotations/g' *.md
perl -pi -e 's/14-the-scala-standard-library/12-the-scala-standard-library/g' *.md
perl -pi -e 's/15-syntax-summary/13-syntax-summary/g' *.md
perl -pi -e 's/16-references/14-references/g' *.md
```

1 files changed, 0 insertions, 54 deletions

diff --git a/spec/02-preface.md b/spec/02-preface.md
deleted file mode 100644
index 50e25d6c00..0000000000
--- a/spec/02-preface.md
+++ /dev/null
@@ -1,54 +0,0 @@
----
-title: Preface
-layout: default
----
-
-## Preface
-
-Scala is a Java-like programming language which unifies
-object-oriented and functional programming.  It is a pure
-object-oriented language in the sense that every value is an
-object. Types and behavior of objects are described by
-classes. Classes can be composed using mixin composition.  Scala is
-designed to work seamlessly with two less pure but mainstream
-object-oriented languages -- Java and C#.
-
-Scala is a functional language in the sense that every function is a
-value. Nesting of function definitions and higher-order functions are
-naturally supported. Scala also supports a general notion of pattern
-matching which can model the algebraic types used in many functional
-languages.
-
-Scala has been designed to interoperate seamlessly with Java (an
-alternative implementation of Scala also works for .NET). Scala
-classes can call Java methods, create Java objects, inherit from Java
-classes and implement Java interfaces. None of this requires interface
-definitions or glue code.
-
-Scala has been developed from 2001 in the programming methods
-laboratory at EPFL. Version 1.0 was released in November 2003. This
-document describes the second version of the language, which was
-released in March 2006. It acts a reference for the language
-definition and some core library modules. It is not intended to teach
-Scala or its concepts; for this there are other documents 
-[@scala-overview-tech-report; 
-@odersky:scala-experiment; 
-@odersky:sca; 
-@odersky-et-al:ecoop03; 
-@odersky-zenger:fool12]
-
-Scala has been a collective effort of many people. The design and the
-implementation of version 1.0 was completed by Philippe Altherr,
-Vincent Cremet, Gilles Dubochet, Burak Emir, Stéphane Micheloud,
-Nikolay Mihaylov, Michel Schinz, Erik Stenman, Matthias Zenger, and
-the author. Iulian Dragos, Gilles Dubochet, Philipp Haller, Sean
-McDirmid, Lex Spoon, and Geoffrey Washburn joined in the effort to
-develop the second version of the language and tools.  Gilad Bracha,
-Craig Chambers, Erik Ernst, Matthias Felleisen, Shriram Krishnamurti,
-Gary Leavens, Sebastian Maneth, Erik Meijer, Klaus Ostermann, Didier
-Rémy, Mads Torgersen, and Philip Wadler have shaped the design of
-the language through lively and inspiring discussions and comments on
-previous versions of this document.  The contributors to the Scala
-mailing list have also given very useful feedback that helped us
-improve the language and its tools.
-