Fixes #5811.

This defaults the choice of AssemblyBrowser on .dll and .exe.
Merge pull request #282 from Therzok/fixAssemblies

Bug 5811 - AssemblyBrowser as default viewer for .dll and .exe
[AspNet] Parser warning should not be Codebehind error
Enable the HTML parser tests
[AspNet] Allow divs within divs
[AspNet] Simplify implicit HTML closing logic
Flush serializer changes to Unit Test project
[TextEditor] Fixed some F# highlighting issues.
Bump monomac
[Core] Don't use underline mnemonics when displaying an error
Bump Mono.Addins
[TextEditor] Fixed color style lookup exception.
[Deps] Bump md-addins.
[Ide] Better warning for unsupported projects