Generalizing the formula so that it works for people using boxen, and so that it doesn't have a hard coded tap dependancy.
Fix #19 (typo)
Major formula rehaul.

- Update binutils to 2.24
- Update gcc to 4.9.0
- Fix clang based compilation
- Modernize and cleanup the formula
Update the README.
avr-gcc: Update to 4.9.1

Patch has been merged upstream and is not needed anymore.
Merge branch 'master' of https://github.com/plietar/homebrew-avr into update
minor look changes
minor look changes
minor look changes
Merge branch 'update'