Added comments

Added comments from the master himself.
Added clipcheck for UM2
Updated changelog

Added previous update to changelog.
Add new firmware update for UM2. Show which firmware you are installing in the firmware update window.
Added fix for scale to max for UM2

Scale to max should always give a viable option. It wil not be the
*best* option. Pretty nasty implementation.
Merge branch 'SteamEngine' of https://github.com/daid/Cura into SteamEngine
Disable the bed level and head offset wizards for UM2.
Add patch for git submodule version. Fixing issue #612
Properly select the first item in the combo box, fixing the problems on linux and mac with the image converter.
Update Cura.po

Fixed and added some translations
Refuse to USB print with UltiGCode flavor.
Update wipe to wipe&prime tower in naming.
Tweak how the quickprint is implemented so it is less code and easier to follow.
Update version number to 13.11.2
Make sure the debian package has all files set to root:root on build.
Firmware 13.11-2
Set the clip size to the size in the UM2.
Merge branch 'SteamEngine' of https://github.com/daid/Cura into SteamEngine
Merge pull request #616 from D-Byte/patch-1

Update Cura.po
Set the default minimal extrusion before retraction to 0.1, the default of 0.5 was a bit too much.