The launcher was never intended for use with 1.7.10, however since people
do use it for this version I generated a 1.7.10 distribution with Nebula
and tested it out. Several bugs were identified and fixed.
* Don't prefix modList paths with absolute on 1.7.10.
* Allow library overrides.
Forge 1.7.10 updates mojang's guava version. As such the library
resolver now supports overriding mojang libraries through the
distribution.json.
Fixes#45.
96db607912