package: use grunt-angular-templatecache 0.2.2

With remcohaszing/grunt-angular-templatecache#2 merged, we will get
better and less verbose output.
package: use grunt-istanbul 0.4.0

With taichi/grunt-istanbul#30 merged, we will get better and less
verbose default output.
Merge pull request #198 from mgeisler/cleanup-build-output

Cleanup build output