F# syntax highlighting had duplicate 'sig' keyword

Removed the duplicate! This is an OCaml reserved word, see:
http://msdn.microsoft.com/en-us/library/dd233249.aspx
Merge pull request #579 from rneatherway/duplicate-sig-keyword

F# syntax highlighting had duplicate 'sig' keyword
Merge pull request #588 from alexrp/master

[configure.cs] Try `/usr/bin/git` before falling back to `git`.
Merge pull request #589 from alexrp/master

[main] Don't silence the invocation of configure.exe to generate buildinfo.
Merge pull request #590 from alexrp/master

[configure.cs] Trim leading `^` if present in `git blame` output.
[Ide] Fix for ResxGenerator parent directory issue

There was a mistake in my last bug fix causing it to look in the parent directory of the intended directory for its files.
Merge pull request #591 from MatthewDiamond/patch-1

[Ide] Fix for ResxGenerator parent directory issue
Fixed Bug 6618 - Find in Files don't work with whole solution option

Included solution items in search.
Merge pull request #592 from vitorelli/master

Fixed Bug 6618 - Find in Files don't work with whole solution option
[po] Fix bad tag casing in nl.po

BXC6676 - HTML characters visible with Dutch language
[T4] Added nuspec
[NuGet] Fixed Bug 18951 - Incorrect path separator used for Import.

https://bugzilla.xamarin.com/show_bug.cgi?id=18951

Incorrect path separator used when adding MSBuild .targets/.props
file to a project when installing a NuGet package. On the Mac the
forward slash character was being used for the path to the .targets
file. All paths in MSBuild project files should use backslash on
all platforms. If forward clashes are used then updating a NuGet
package on Windows will fail to remove the old import from the
project. It will also cause the build to fail since the path is
resolved to a directory inside Program Files.
[NuGet] Remove forward slash imports when updating a package.

Fixes Bug 20610 - Xamarin Forms samples will not build on Windows
even after package update.
https://bugzilla.xamarin.com/show_bug.cgi?id=20610

On uninstalling or updating a NuGet package, .targets file imports
are removed from the project if they contain forward slashes and if
they contain backslashes. This allows the project to fix itself
without requiring manual editing of the MSBuild project file.
Fix  20533 - Project Reference 'properties' is showing disabled
Fixed Bug 6620 - Cannot properly remove item from current solution

Bug happened because after deletion file, the solution was not save.
Merge pull request #593 from vitorelli/master

Fixed Bug 6620 - Cannot properly remove item from current solution
[MSBuild] Add extension point for global properties

Also unifies setting core global properties.
[MSBuild] Remote builder support for arbitrary target/item evaluation

Not exposed yet, but used for reference evaluation.
[Core] Fix recursive includes for custom MSBuild frameworks
[Core] Filter overridden assemblies from chains of framework includes

And fix up refreshing/reloading stuff as appropriate.