settings.LETTUCE_SERVER_PORT support + bump to 0.1.21

bump to 0.1.20, adding release notes. closes gabrielfalcao#99

bump to 0.1.19

fixing verbosity support on django, bump to 0.1.18

bump to 0.1.17

improving the import error for terrain.py and bumping to 0.1.16

releasing 0.1.15 with contributions of Andres Jaan Tack

implementing django hooks + bumping to 0.1.14. closes gabrielfalcao#49

google app engine + django support

bump to 0.1.12