Added grunt development task

Added grunt task to:
- build:development
- connect
- watch
removed unused npm task

grunt-shell is loaded but not installed and never used. Removed it.
Merge pull request #5 from mchambaud/master

Added grunt development task
Merge branch 'master' of github.com:calvinl/ng-phonegap
Merge branch 'development' of github.com:calvinl/ng-phonegap into development
Merge branch 'master' into development