Support inlining files which are force-interpretted as LESS.

This change is merely compatibility with LESS syntax. In our implementation everything imported by JAGGR will be interpretted by LESS.
Make inline imports occur prior to processing the CSS.

This change makes the CSS processing step only in-line images and
minify resulting CSS. The means that any subclasses of
CSSModuleBuilder should handle their own in-lining of @import
statements.
Change the LESS compiler used.

This change also uses JAGGR's own @import in-lining.
Fix CSSModuleBuilder test.

Test was broken because minify was moved to a different point in the aggregation process.
Merge pull request #180 from KenPowers/lesscss-java

Change LESS Compiler
Add getProperty() config scope method and invoke aggregator variable
resolver for all init-params (servlet + extensions).
Merge commit '18c6ffbb1e9ecc8d5d2b75f33cfddbf594c21226'