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 #560 from nallar/guaranteedorder

Ensure alphabetical instMods loading order - File.list() does not guaran...