Switch references back to VS2013.

I only have 2013 installed here; so these DLLs are missing.

According to this page:
http://msdn.microsoft.com/en-us/library/bb166545.aspx

"Managed VSPackages must be built using a version of Visual Studio and
the Visual Studio SDK that match the target version of Visual Studio."

:o(
Removed some unused references.
Removed some unused references.
Reformat files ;-)
Tweaks to syntax highlighting regexes.

Issue #4. Found a good list of keywords from the Dart site, and added
word boundaries to ensure there are no partial matches in the middle of
words (eg. in a method called resetBlah, the "set" was matching).