fixed layout bug ('period' on numpad layer)

'_dec_kp' (the keydoce for keypad decimal) doesn't appear to work...
Merge branch 'dev'
changed filename of output .zip files
changed the generated .zip filename back... lol

i like the original one better. i'll find another way to make the
filenames small for the most current ones on dropbox, so that they're
easy for people to find.
revised the readme
added toc in readme.md
Merge branch 'master' of git://github.com/benblazak/ergodox-firmware