chore(dependencies): upgrade `bower` to v1.3.1

Closes #20
chore(dependencies): upgrade `grunt-contrib-concat` to v0.4.0
chore(dependencies): upgrade `grunt-contrib-jshint` to v0.10.0
chore(dependencies): upgrade `grunt-contrib-watch` to v0.6.1
chore(dependencies): upgrade `grunt-karma` to v0.8.2
chore(dependencies): upgrade `karma` to v0.12.3
chore(dependencies): remove `karma-coffee-preprocessor`