Change clone to main MG-RAST repo

Author: Will Trimble

tests/Dockerfile

@@ -4,5 +4,5 @@ RUN apt-get update && apt-get install -y git make python python-setuptools  gcc
 
 # setproctile  needs Python.h from python-dev
 # requests needs gcc to build
-RUN git clone http://github.com/wltrimbl/MG-RAST-Tools
+RUN git clone http://github.com/MG-RAST/MG-RAST-Tools
 RUN cd MG-RAST-Tools && make install