Updated SBT to 0.13.5.
Removed deprecated SBT functionality.
Updated README.md to match new SBT version
Merge branch 'master' of https://github.com/KevinCoghlan/scalafx into KevinCoghlan-master
Merge branch 'KevinCoghlan-master'
Merge branch 'patch-1' of https://github.com/KevinCoghlan/scalafx into KevinCoghlan-patch-1
Merge branch 'KevinCoghlan-patch-1'
Merge remote-tracking branch 'origin/master' into SFX-8