Allow for placeFiles not finding Mms

Otherwise errors will be thrown if the FILES array is modified for another
set of targets.
Fix using github.com address as argument

I have found that ordering the aosp_* builds suffices for my purposes, but
it would not work for those who wanted to use this as a build script.
Run removePdroid after sucessful makePatches

You can always reapply if you want. Hopefully this won't come back to bite
me, but accidentally leaving the patches in is compromising the automation
Only populate envset variables if empty

Setting up for orderBuilds to run all scripts in succession. Still need to
write populatePatcher or whatever.