Upgrade to FCS 0.0.71

* Move project parsing code to FCS
* Also move unit tests to FCS
* Update to match renames in FCS SourceCodeServices
Update appveyor emacs link
Upgrade ExtCore reference to 0.8.43 in MonoDevelop.FSharpBinding project. The new version references FSharp.Core 4.3.0.0, which should fix assembly-resolution issues some users were seeing on Windows.
Merge pull request #775 from jack-pappas/extcore-0_8_43

Upgrade ExtCore reference to 0.8.43 in MonoDevelop.FSharpBinding project
rework vim plugin to integrate into syntastic plugin

Instead of reinventing on-the-fly code/type checking fsharp-vim
can reuse the existing functionality of the syntastic plugin.
adjust Makefile with new files
<leader>i does type checks only
fix error highlighting
write logfiles in debug mode only
update README
README: autocommand for fsharp files only
close scratch window after leaving insert mode
README: add hint to debug mode
type checking should map to <leader>t instead
Merge pull request #770 from kongo2002/syntastic_refactor

rework vim plugin to integrate into syntastic
Update to FCS 73
Update Emacs link in AppVeyor
Merge pull request #773 from rneatherway/fcsprojectparser

Use FCS Project parser for FSharp.AutoComplete