Created LessModuleBuilder with tests.
Fixed formatting of `plugin.xml`.

`plugin.xml` had inconsistent indentation. This changes it to use "smart
tabs."
Added `LessModuleBuilder` to plugin.xml.
Added copyright header to test.
Removed extra spaces from pom.xml.
Remove custom cache key generator.
Now throwing RuntimeException on failed Less build.
Making formatting more readable.
Changed "compress" to "lessCompressOutput".
Now routing Less' CSS output through the `CSSModuleBulider`.
Removed duplicate `readToString` method.
Removed `Messages.java`.
NSL string updates
Merge pull request #154 from chuckdumont/nio

NSL string updates
Changes needed to develop the non-osgi sample of JAGGR.
Added comment explaining compilation procedure.
Adding lesscss-engine to the jaggr-core package.
Fix of unit test failures
Merge pull request #155 from projsaha/JAGGR_master_merge_3

Changes needed to develop the non-osgi sample of JAGGR.
Identify the jaggr-core bundle as jaggr-core