[SPARK-1292] In-memory columnar representation for Spark SQL

This PR is rebased from the Catalyst repository, and contains the first version of in-memory columnar representation for Spark SQL. Compression support is not included yet and will be added later in a separate PR.

Author: Cheng Lian <lian@databricks.com>
Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #205 from liancheng/memColumnarSupport and squashes the following commits:

99dba41 [Cheng Lian] Restricted new objects/classes to `private[sql]'
0892ad8 [Cheng Lian] Addressed ScalaStyle issues
af1ad5e [Cheng Lian] Fixed some minor issues introduced during rebasing
0dbf2fb [Cheng Lian] Make necessary renaming due to rebase
a162d4d [Cheng Lian] Removed the unnecessary InMemoryColumnarRelation class
9bcae4b [Cheng Lian] Added Apache license
220ee1e [Cheng Lian] Added table scan operator for in-memory columnar support.
c701c7a [Cheng Lian] Using SparkSqlSerializer for generic object SerDe causes error, made a workaround
ed8608e [Cheng Lian] Added implicit conversion from DataType to ColumnType
b8a645a [Cheng Lian] Replaced KryoSerializer with an updated SparkSqlSerializer
b6c0a49 [Cheng Lian] Minor test suite refactoring
214be73 [Cheng Lian] Refactored BINARY and GENERIC to reduce duplicate code
da2f4d5 [Cheng Lian] Added Apache license
dbf7a38 [Cheng Lian] Added ColumnAccessor and test suite, refactored ColumnBuilder
c01a177 [Cheng Lian] Added column builder classes and test suite
f18ddc6 [Cheng Lian] Added ColumnTypes and test suite
2d09066 [Cheng Lian] Added KryoSerializer
34f3c19 [Cheng Lian] Added TypeTag field to all NativeTypes
acc5c48 [Cheng Lian] Added Hive test files to .gitignore

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