Refactor Grunt tasks

- upgrade grunt plugins
- move *.spec.coffee into /src/spec and keep /test as destination for compiled test sources
- introduce automatic release (bump + tag + push) using grunt release:target
gitignore test folder
Also update version in component.json when releasing
List deps in package.json
Update documentation
gitignore SpecRunner
Remove bootstrap dep from package.json
Remove generated source
Adjust grunt tasks list
Clean all popovers after each spec
Bump version to 0.6.2
Merge branch 'master' into develop

Conflicts:
	Gruntfile.coffee
	build/css/bootstrap-tour.min.css
	build/js/bootstrap-tour.js
	build/js/bootstrap-tour.min.js
	docs/assets/css/bootstrap-tour.min.css
	docs/assets/js/bootstrap-tour.js
	docs/assets/js/bootstrap-tour.min.js
	docs/assets/js/index.js
	docs/index.html
	test/build/bootstrap-tour.spec.js