Merge pull request #13 from ShutOstrich/master

Build fix

Now requires a minimum of C++11: Use of undeclared identifier 'nullptr'

Update to FCEUX 2.6.3

Bump version for sparkle updater. Core is still 2.2.3

Bump version for sparkle updater. Core is still 2.2.3

Update to FCEUX 2.2.3

Bump version for sparkle updater. Core is still 2.2.2

Clean up deprecated methods.

Improve errors in FCEU.