Fixes #971.

     Background:

     As discussed in the dev team all hands all code under the GitHub dotnet foundation is using a single process for contribution, API review, infrastructure and coding style. The idea is to present a unified view to our customer and give them a single story for contributing to any project under the dotnet foundation.

     https://github.com/dotnet/corefx/wiki/Contributing#c-coding-style

     The coding style transition is automated using a Roslyn based rewrite tool:

     https://github.com/dotnet/codeformatter

     This will be applied in stages across our developer tree. Right now the focus is on the Open directory as this is what is being presented on github. Code owners will be contacted before the transition happens.

     Note: this is a soft style requirement. There are no build errors that come from this change.
 (changeset 1408227)

Add an instance public Kind() method on CSharpSyntaxNode and VisualBasicSyntaxNode as a replacement for obsoleted CSharpKind(), VBKind(). (changeset 1389507)

The original code simply walked the binder chain until one of InCatchBlock or InFinallyBlock was dropped from the binder flags. Unfortunately, this algorithm cannot handle multiply nested catch/finally blocks and would incorrectly issue CS0724 for patterns similar to the code given below:

try
{
}
catch
{
    try
    {
    }
    finally
    {
        try
        {
        }
        catch
        {
            throw;
        }
    }
}

The new code binder flag that is set for finally clauses nested inside try clauses and reset at catch clauses to detect this sort of nesting.
***NO_CI***
 (changeset 1378936)

Splits Microsoft.CodeAnalysis, Microsoft.CodeAnalysis.CSharp and Microsoft.CodeAnalysis.VisualBasic into portable and desktop assemblies.

Existing Core\Source, CSharp\Source and VisualBasic\Source directories are renamed to Core\Portable, CSharp\Portable and VisualBasic\Portable.
New sibling Desktop folders are added and non-portable source is moved there.
"System.Runtime" references has to be removed in order for the portable project system magic to automatically add facade references.
 (changeset 1281686)

Migrated state of “Declaration Expressions” implementation equivalent to https://roslyn.codeplex.com/SourceControl/changeset/b7fd08a5695e21cd4d23b8b70815c53656dab65f. (changeset 1249879)