adding gulpfile and some tasks
separating gulp tasks into folder as single files
updating app to ask for task runner and move correct files
fixed failed test
fix grammatical error
adding jshintignore file
FIXES COFFESCRIPT AND UGLIFY TASKS.

 - Fixes path of generated javascripts (before: jscoffe/*.js;
   now: js/coffee/*js).
 - Fixes uglify conf in order to process also subdirs.
Merge pull request #5 from natgeo/feature/gulp

Adding Gulp