Merge pull request #802 from jikuja/fixes_for_v1.4.0

Fixes for v1.4.0
use a properties file instead of the manifest for launcher jenkins versions should fix exe beta channel updates
Merge branch 'master' of github.com:Slowpoke101/FTBLaunch
add xml spec to put additional MC versions in packs
installer now checks the MC version against the pack version as well
fix NPE in new code
2nd NPE fix on the new modpack code
fix derp copying/pasting
CHANGED: minor fixes to map and texturepack pane

 * do logging only if xml is referring non-existing modpack
 * refactored code to check both modpack panes when reordering maps/texturepacks