Merge remote-tracking branch 'upstream/stabilization' into merge-stabilization-into-master20160601-201349

Merging to unblock folks who are blocked on the build issue asap.

Order GlobalNamespace declarations to match Compilation.SyntaxTrees

* Tests: fix minasync Task<T> to derive from Task

* Tests: provide MinAsyncCorlibRef

This combines the async features of minasync with mincorlib to produce
a minimum unversioned corlib with async stubs.

* Compilation: use System.Object from target corlib

When creating a script compilation without an explicit return type,
System.Object was being resolved via reflection from the host.

This resulted in an implicit dependency of a script compilation on the
host corlib, even if a different corlib was specified as a reference
for the compilation (e.g. Xamarin.iOS).

Fix this by using System.Object as defined in the corlib resovled
for the compilation.

* Tests: fix minasync Task<T> to derive from Task

* Tests: provide MinAsyncCorlibRef

This combines the async features of minasync with mincorlib to produce
a minimum unversioned corlib with async stubs.

* Compilation: use System.Object from target corlib

When creating a script compilation without an explicit return type,
System.Object was being resolved via reflection from the host.

This resulted in an implicit dependency of a script compilation on the
host corlib, even if a different corlib was specified as a reference
for the compilation (e.g. Xamarin.iOS).

Fix this by using System.Object as defined in the corlib resovled
for the compilation.

Update the branches and build badges to current targets

Suppress dynamic access to instance indexers off of types.

Fixes some of the scenarios for https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems?id=204561&_a=edit.

Disallow invocation of extension methods off of types as query operators.

Fix merge issues that made filtering completion to nothing crash VS

stabilization is now for Visual Studio 2015 Update 3, master is
targeting Visual Studio "15".

Remove SolutionExplorer ProjectItem base classes added in 56136680

Fixes #556 - Add Fields/Constants to VB Nav Bar

Fix incorrect glyph for locals and parameters.

* Add projects for the runner and utilities

* added benview uploader

* added trace-file backup

* remove old scripts and tools

* Misc fixes

* Added a test-this-please jenkins job

Harden active statement mapping

Fixes some of the scenarios for https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems?id=204561&_a=edit.

Updates CoreFX dependencies to rc3-24126-00

* Update VirtualTreePoint.cs

Correct the braces so that they are escaped.

* Update VirtualTreePoint.cs

Convert the `String.Format` to an Interpolation String.

* Update VirtualTreePoint.cs

Correct the variable.

removed culture dependency from ConversionsTests

Block any commits that derive from a bad merge we removed via force push

- It should no longer block future -> master merges, since we've done
  that now.
- It should block any new pull requests that contain the previous
  bad merge.

Add ChecksumAlgorithm to csc/vbc build task

Fixes #10451

Don't classify the entire document when we're accurate tagging.

Fixes #11559

Port two Update3 changes to stabilization.