Improvements

* Upgrade bower.json dependencies
* Removed redundant dependencies
* Removed uglify for vendor_body, instead I've used concat and used the
minified version of each bower.json dependency.  This massively improves
performance
* Removed uglify for vendor_header for the same reasons
* Added grunt-contrib-concurrent - 10x improvement in initial grunt
performance
* Added grunt-file-exists to check vendor_body dependencies actually
exist (didn't bother with header)
* Upgraded server/client signalr libraries
* Set the helloworldhub to "broadcast" to caller
* Updated message in home.html
* Added a "Starting up" message to index.html (before ui-view kicks in)
* Gruntfile know copys bootstrap fonts into public/fonts - useful for
any bootstrap dependent angularjs components that expect the fonts to be
there