Merge pull request #6 from dimalev/refactor

refactoring JLog to be modular, testable and full-fleged.
TODO: Remove underscore.js and jquery.js either user npm or bundler, rake can configure nodejs env
Minor fixes
Added helpers to format Error backtraces
Removed the just_underscore dependancy from gemspecs: users should handle JS dependancies themselves
Added missing semicolons and Removed unecessary ones