- Ignore '*.moc' files (foo.moc created when foo.cpp contains a Q_OBJECT.)
- Ignore '/.qmake.cache' and '/.qmake.stash' as does the official Qt Creator project.

moc automatically generates "ui_*.h" files for each *.ui file.
Since they are auto-generated I assume they should be ignored.
Signed-off-by: NAlexey Brodkin <alexey.brodkin@gmail.com>

With "CONFIG=debug_and_release" qmake generates both Makefile.Debug and
Makefile.Release. And I assume it is useful to have all types Makefiles
ignored.
Signed-off-by: NAlexey Brodkin <alexey.brodkin@gmail.com>