[NEW] Add VS 2013 support.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1278 f5eea248-9336-0410-98b8-ebc06183d4e3
[BUG_FIXED] (Author: Pavel Nedev) Fix docSwitcher bug which shows new 0 after loading a session of files.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1279 f5eea248-9336-0410-98b8-ebc06183d4e3