Added task for heroku deployment to Gruntfile
Some devDependencies moved to dependecies (due to the heroku deployment)
Fixed list of tasks for `heroku` task
v0.4.1
v0.4.2 - add missing grunt-mocha-cli dependency, added .buildpacks file
v0.4.3 - Added grunt buildpack to buildpacks list
v0.4.4 - Updated Readme.md, exactly link to demo on heroku