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`.
Added comment explaining compilation procedure.
Adding lesscss-engine to the jaggr-core package.
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
Updated to build sample project properly.
Make formatting of sample JavaScript files consistent.
Added Less example.
Reduce URL lengths with module name id encoding