Fix vogl build when using chroot CMakeLists.txt file.
Configure SDL2 for voglreplay on Linux.
Merge pull request #74 from armyofzin/SupportSDL_2014.05.22

Configure SDL2 for voglreplay on Linux.
SDL Linux cleanup
Some minor gcc 4.8 warning fixes
Removed two trace commandline options which are not actually used anywhere
UI: Fix width of "..." button on QTrimDialog so that it takes up less space
UI: Add support for generating trace files from within the editor
* Applications can now be launched and traced from the editor!
* The dialog box is kept as a member object of the main window so that if the user cancels out of the dialog box, it will automatically remember its contents the next time it is opened (provided the editor is closed / reopened).
Merge branch 'master' of https://github.com/ValveSoftware/vogl