Merge pull request #563 from 7sharp9/master

Ensure that only dll references are included in pcl search path
Add define for Mono Develop 4.2.5
Add "send file to F# interactive" command to MonoDevelop
Merge pull request #569 from 7sharp9/master

Fix for #565
Merge pull request #567 from jmquigs/jq-monodevelop-sendfiletofsi

Add "send file to F# interactive" command to MonoDevelop