Update build

better error handling (exiting instead of attempting to continue)
ZIP files created won't have extra crap in them (however I might need to
 add `-x "*.DS_Store" -x "__MACOSX"` to actually get rid of Mac crap
 entirely, that remains to be understood by me)
Update build

Mac packages are named $packageName.app instead of love.app
Spaces are allowed in paths / filenames now
config.txt changed to config.sh
Rename config.txt to config.sh
Quiet zipping/unzipping
updated readme
Merge branch 'master' into testing
fixed a thing here I should have fixed on master instead