Update to Minecraft 1.7.10

Successfully builds for 1.7.10

Some important information:
Development environment needs to be updated
 - Scala plugin and libraries for 2.11.1
 - If using gradle (not the wrapper) update to 2.0

The scala JSON package is deprecated so switched to gson as I found it in the classpath, _should_ work same as before.
I didn't bother to find out what `keysIteratorFrom` should do so it just throws an exception.

All dependencies updated to their 1.7.10 versions.