Introduced the native packager plugin in place of the customised "dist" task.
Fixes to get native packager working.

* Remote pattern matching so type error shows up
* Move native packager settings *First* so they don't override play settings on a project.
* Add compile:package-bin to the libraries list in the distribution.
Leverage the packager's makeBashScript key and other tweaks
Bump native packager to latest milestone.

* Update PlaySettings to bat file is generated
* Bump milestone build of native package

Use native-packager java-application archetype for packaging (for now).

* Annotate types on public members in PlayCommands
* Ensure script has executable permissions
* Update to use java_application settings rather than just base packaging.
Moved to 0.6.0 of the native packager and integrated with native packager script production
Documentation and tests for the new "dist" behaviour
A little help for the compiler to speed things up
Some clarifications around what is required for invoking a script.
Changes as a result of PR feedback - mostly cosmetic.
README files can also have extensions such as .md. This commit permits all types. Any file named README in the base directory will now be copied over (including the possibility that there is no README).
Merge pull request #1209 from huntc/new-dist

Improved dist task