Merge stabilization into master

Merge remote-tracking branch 'upstream/stabilization' into merge-stabilization-into-master20160219-160019

Revert "Revert "Merge pull request #7510 from CyrusNajmabadi/analysisSpeedup""

Removing recursion in SyntaxNode.FindTriviaByOffset

Revert "Merge pull request #7510 from CyrusNajmabadi/analysisSpeedup"

This reverts commit 4ed5b596, reversing
changes made to 29ab8cba.

Ask Mode request: Fix IndexOutOfRangeException when running operation actions over Roslyn sources.

Reanalyze a project when it's name changes.

Fixes #8565

Fix vbc crashing when compiling 0 files into a library 

Update roslyn semantic version from 1.2 to 1.3

(with test)

Adding VB test for this change and original fix #5528

Ignore dlls that come from a 'packages' directory when searching for viable metadata references to search.

Fixes #8577

Abort SigHelp if navigation keys before presented

added some comment suggested by previous PR

Merge stabilization into master

Clarify behavior when RunServerCompilation throws an exception

Remove assert that SymbolDistinguisher descriptions are distinct

added "Adding optional parameters to public methods" doc with how to …

Remove some hacks when we were on RTM

Ask Mode request: Fix IndexOutOfRangeException when running operation actions over Roslyn sources

Reuse the SupersedeLowerVersions flag in the EE

Move interactive commands out of InteractiveFeatures

Disable Failing Documentation Tests (Stabilization)

Merge stabilization into master

Disable Failing Documentation Tests

Scripting scenarios set a special flag in the ReferenceManager to enable
additional tie-breaking rules in the presence of conflicting references.
Enable that same flag for the EE, which also routinely encounters
conflicting references.

Fixes internal bug 161294.