Fix for issue #4946.
Fixes KCoding bug in Silverlight build.
Adding initial implementation of the _csv module.
Fixed to use per context field_size_limit and dialect registry.
Fixed spellings of "required"
Removes unused files, adds CreateRelease.bat to IronRuby
Merge branch 'master' of https://github.com/slide/main into slide-master
Add test_csv to IronPython.tests.
Update AssemblyFileVersion to 2.7.1.0.
Merge branch 'slide-master' into ipy-2.7-maint
Fixes IronPython CLR2 build.
(cherry picked from commit a04ffe823a7f21da622044532644157b038b21d8)
Make _csv compatible with .NET 2.

The StringBuilder.Clear() method is new in .NET 4, so add an extension method when building for .NET 2.
Add test_ast.py to IronPython test list.
Add _ast module.
Reformat _ast.cs to match rest of IronPython.
Integrate _ast module with builtin compile().

compile() needs to return an AST instance when called with the PyCF_ONLY_AST flag.
Get more snippets to pass in test_ast.

The _ast module did not handle _attributes, had line/col_offset on nodes they weren't needed on, and was using some singleton instances when it shouldn't (as each instance needs its own lineno/col_offset).
Adding v2 build configurations to IronPython.Mono.sln
(cherry picked from commit 258b8ccb54c4002e30d0e812b2e40cdb1eea6088)
Disablex XML comments warnings for Microsoft.Scripting.Core
(cherry picked from commit a8d9bc96aefcdb30bfd93a091b60ffb8fa4a8e4a)
Fix issues with ast slices.

Empty slices (x[::]) were not properly handled, and there was an extra node is the produces tree for slices.