use the right hash for md-addins
Bump gui-unit to allow our tests to compile again

We need it signed.
Bump md-addins
Bump md-addins and gui-unit so our tests compile
Improve docs
[tests] Bump so we run tests in the right test runner
Change guiunit signing key to one that builds

BXC15736 - Cannot build on .NET 4.5.1
[Docs] Update README to match configure.
[Projects Tests] Change mdb to pdb compatibility for projects using msbuild.
Change guiunit signing key to one that builds

BXC15736 - Cannot build on .NET 4.5.1
Bump md-addins for guiunit build fix
Bump md-addins for guiunit build fix
Updated package version to 4.1.13
Updated add-ins version to 4.1.13
[TextEditor] Fixed potential problem in height calculation.
Fixed 'Bug 15476 - Cursor is getting stuck when deleting last empty
line with indents '.
Updated references to xwt, md-addins
bumped version-checks for md-addins fixes
bumped version-checks for md-addins fixes
[README] Replace old readme with markdown.