added debug method in the log object of helpers
Merge branch 'master' of github.com:thanpolas/grunt-closure-tools

* 'master' of github.com:thanpolas/grunt-closure-tools:
  Fixes function call: s/.closureCompiler/.compileCommand
prepering test cases
moved libraries to lib folder
updated require paths in tasks
updated require paths in tasks
fixed bug where task broke if no inputs are defined
fixed validation checks for compiler task
created basic tests for all grunt tasks