Upgrade to Visual Studio 2013

[dcwhite]

Not sure when to attempt this; may want it soon for std::thread in SolveLinearSystem (will try first with boost::thread in VS2010).

[dcwhite]

Will depend on getting the external projects working on Windows, see #17.

[dcwhite]

Dan will try building Qt 4.8.5 in VS2013 again.

[dcwhite]

Qt builds fine, but boost is now the culprit. We will wait for the next boost release.

[dcwhite]

Boost release is taking forever. We should try the boost/svn trunk to see if that builds. @aylakhan