Added working explorer method
 * Transform msys2 paths into windows path before passing it to original
   explorer. This way, you can do `explorer ~/path` and it works!
Merge branch 'msys2' into msys2-machine
Merge remote-tracking branch 'origin/msys2-machine' into machine-work
Added Groovy to PATH and set Java 1.7 as default
Removed gradle.properties
 * This file does not belong to this level, moreover, it's not in the
   right location anyway.
Merge branch 'msys2' into msys2-machine
Merge branch 'msys2-machine' into machine-work