WIP: Scala native (#206)

* add scala-native PR#1143 as submodule

* first pass at integrating scala-native build into mill

including worker/bridge

* add the native libraries to the compile and run classpath

* sssshhh don't be so noisy

* update scala-native to latest build WIP

* update mill to latest scala-native build-api code

* add test interface from scala-native

this code is not published ornot published at the correct scala version so copy it in for now

* implement tests for scala-native

very messy at the moment
also correct bridge version as much as possible with out a scala-native release

* update to scala-native/master

scala-native #1143 now merged

* Remove scala-native submodule

* updates for scala-native 0.3.7 release

* fixes after rebase

* make test framework agnostic and tidy dependencies

* add robust method of getting JVM classpath for running tests

support for multiple test frameworks
tidy up

* rebase fixes for 0.2.0

* add SbtNativeModule and tidy

* rebase fixes

* fix building of compile / run Classpath (via transitiveIvyDeps)

better method of loading JVM test frameworks

* add tests for build, run, utest, scalatest

* move native tests into it own trait which can be extended/overidden

* change release mode to a sealed trait instead of boolean

* add logLevel to ScalaNativeModule and plumb in

propagate release and log levels to test projects

* use test-runner from scala-native instead of including project source

add ability easily compile against scala-native snapshots

* add some docs

* update to 0.3.8

1 files changed, 24 insertions, 0 deletions

diff --git a/docs/pages/3 - Common Project Layouts.md b/docs/pages/3 - Common Project Layouts.md
index a8c55a10..01ec2e85 100644
--- a/docs/pages/3 - Common Project Layouts.md
+++ b/docs/pages/3 - Common Project Layouts.md
@@ -101,6 +101,30 @@ latter of which runs your code on Node.js, which must be pre-installed)
 `ScalaJSModule` also exposes the `foo.fastOpt` and `foo.fullOpt` tasks for
 generating the optimized Javascript file.
 
+### Scala Native Modules
+
+```
+import mill._
+import mill.define._
+import mill.scalanativelib._
+
+object nativehello extends ScalaNativeModule {
+  def scalaVersion = "2.11.12"
+  def scalaNativeVersion = "0.3.7"
+  def logLevel = NativeLogLevel.Info // optional
+  def releaseMode = ReleaseMode.Debug // optional
+}
+```
+
+`ScalaNativeModule` builds scala sources to executable binaries using [Scala Native](http://www.scala-native.org). 
+You will need to have the [relevant parts](http://www.scala-native.org/en/latest/user/setup.html)
+of the LLVM toolchain installed on your system. Optimized binaries can be built by setting
+`releaseMode` (see above) and more verbose logging can be enabled using `logLevel`.
+Currently two test frameworks are supported [utest](https://github.com/lihaoyi/utest) and [scalatest](http://www.scalatest.org/).
+Support for [scalacheck](https://www.scalacheck.org/) should be possible when the relevant artifacts have been published
+for scala native.
+
+
 ### SBT-Compatible Modules
 
 ```scala