Merge pull request #16 from 7sharp9/merge-parsing

Cleaned up old code in CompilerBinding
Correct a few small bugs found with new test
Merge pull request #262 from rneatherway/merge-parsing

Merge parser combinator libraries from fsautocomplete and monodevelop binding
Add forward parsing for active patterns
Allow leading pipe
Correction of parser precedence
Merge pull request #265 from rneatherway/issue217

Issue217
Add a few test artefacts to gitignore
Add test of Active Pattern tooltips
Requires F# 3.0
Merge branch 'master' of github.com:fsharp/fsharpbinding into refactoridentparsing