Set peerdependency of grunt to 0.4.5 
Set peerdependency of grunt to 0.4.5 

Fix for users that don't want to use grunt@1.0.0 (or cannot use)

See this section in the releases notes of grunt:
http://gruntjs.com/blog/2016-04-04-grunt-1.0.0-released#peer-dependencies
devaos/grunt-port-pick,devaos/grunt-port-pick