Update DEVELOPER.md

DEVELOPER.md

 # Bootstrap manual for developers
 _Dependencies: tox, nose, epydoc_
 
+### Testing
+
 For testing we are using tox virtualenv-based Python version testing
 and nose as test framwork.
 
@@ -12,19 +14,12 @@ link below.
 Maxmind sample databases for testing can be downloaded here:
 http://www.defunct.cc/maxmind-geoip-samples.tar.gz (58 MB)
 
-Extract the tarball in the tests directory and run tox from the root directory.
-
-Please make sure your code passes all tests before opening pull requests.
+Extract the tarball in the tests directory and run `tox` from the root directory.
 
-### Testing
-
-You can run all tests if you from root type `tox`. This requires a machine
-with Python 2.5 - 3.3 installed and all dependencies mention in the header.
+This requires a machine with Python 2.5 - 3.3 installed and all dependencies mention in the header.
 
 ### Documentation
 
-The documentation can be re-generated by running following command from root:
+The documentation can be re-generated by running epydoc from repository root.
 
     epydoc --config=epydoc.ini --no-private
-
--- William Tisäter