Add less.js(lessc) to package.json

Add less.js(lessc) to package.json

Modify Cakefile to use less js library render as opposed to exec
Remove trailing commas
Fix Lack of Error Reporting

Fix Lack of Error Reporting

Display error if one is returned by less render and do not write file

Continue building additional less files after error
Merge branch 'add_lessc_to_package_json' of https://github.com/mkly/mondrian into lessc
Refactor into helper method