ignore build dir
Merge branch 'master' of github.com:nohn/keepassx into master

https://github.com/keepassx/keepassx/pull/29
Use QString::toLatin1() rather than ::toAscii()

The toAscii (and fromAscii) are removed from Qt5 in favor of Latin1.
Enable the foritfy source build flag only for optimized builds.

https://github.com/keepassx/keepassx/pull/27
Set default build type to RelWithDebInfo.