Update gruntfile.js
Simple modifications to allow for production and development asset management.

- Added csslint with bootstrap's .csslintrc file (fixed css lint warnings in common.css)
- Added cssmin and uglify to compress assets during production builds
- Added assetmanager to switch assets files in the template respectively for production and development builds
Update default.html

Fixed. Spent days and eventually 40$ fixing this. Under certain conditions, the header wouldn't load.
Update assetmanager to 0.1.1

assetmanager 0.1.1 supports external asset files i.e. cdn assets.
Fixed issue #320 #314 - @Drew - this is the beginning of the cleanup...
Merge pull request #307 from leejessy/patch-1

Update gruntfile.js
Merge branch 'patch-1' of https://github.com/Squ34k3rZ/mean into Squ34k3rZ-patch-1
Merge branch 'master' of http://github.com/linnovate/mean
Merge branch 'master' of https://github.com/ReedD/mean into ReedD-master

Conflicts:
	package.json
Merged right
missing grunt-contrib-csslint