Developers Version - Very Hackish :) Brian Wang (Co-Founder of Fitocracy) finally answered my question and as it seems he does not want us to develop an Android client. See the README for further details.
This is currently only a "edit-some-prefs-then-compile-yourself-developers"-version.
It was working at the time I initially commited it, never checked again then.
I will actively start developing in about 2 weeks again.
Sad thing is that we have no support from fitocracy.com :(
Let's see how that goes.