Ensure alphabetical instMods loading order - File.list() does not guarantee alphabetical order, which FTB modpacks depend on. Also, allow renaming forge jars to the correct capitalisation, as that matters with linux/mac. Actually log errors launching minecraft, instead of ignoring them.

Signed-off-by: Ross Allan <rallanpcl@gmail.com>
Merge pull request #559 from nallar/master

Set java options to increase permgen size and enable concurrent mark sweep class unloading. This should resolve crashing issues people are having with mod packs with many mods installed.
Merge pull request #560 from nallar/guaranteedorder

Ensure alphabetical instMods loading order - File.list() does not guaran...
Fix a comodification exception loading locales

Signed-off-by: Ross Allan <rallanpcl@gmail.com>