Merge pull request #1 from nomacs/master

Getting my branch back to speed
Revisited #305 and added natural sorting

Now sorts correctly for floating point numbers as well as "normal" natural sort
with leading zeros and spaces ignored.

Code is inserted from the OpenMW project (under GPLv3) and is credited in comments.

Example:
93.jpg
94.jpg
0.942e2.jpg
94.99999.jpg
0.95e2.jpg
100.jpg
0.95e3.jpg
20140808-1802-P1000002.jpg
20140808-2128-P1000028.jpg
20140808-2148-P1000031.jpg
20140817-0940-P1000162.jpg
Kaya 1 photo 1.jpg
Kaya 1 photo 2.jpg
Kaya 1 photo 10.jpg
Kaya 2 photo 2.jpg
Merge pull request #4 from nholmgaard/master

Revisited #305 and added natural sorting
added nomacs.appdata.xml and installed it to the correct location
added checkForUpdate Checkbox to settings
hide new checkbox (check for update) in linux
Prefer cmake over pkg-config when setting up OpenCV configuration

pkg-config support in OpenCV-2.4 is somewhat broken:
http://code.opencv.org/issues/1925
Merge pull request #5 from plaes/opencv-cmake

Prefer cmake over pkg-config when setting up OpenCV configuration
Merge remote-tracking branch 'remotes/origingithub/master' into developer

Conflicts:
	ImageLounge/cmake/UnixBuildTarget.cmake