Fix race condition on error fetching

Sometimes the appropriate buffer was determined using the
minibuffer as the filename, which resulted an error. This
guards the overlay printing

The communication should include which filename the errors
are for to avoid this kind of issue in the future.
Commit for discussion
Fix command line build of FSharp.AutoComplete
Also fix building in Monodevelop (with NuGet addin)
Removed FSharpLocalResolveResult
Merge pull request #17 from 7sharp9/tooltip-changes

Removed FSharpLocalResolveResult
Correct most of emacs syntax highlighting

Use syntax-propertize-function
Merge pull request #289 from rneatherway/tooltip-changes

Tooltip changes
Merge pull request #292 from rneatherway/emacs-syntax-highlighting

Emacs syntax highlighting
updates to project files to find nuget packages
Merge pull request #293 from dsyme/master

updates to project files to find nuget packages