Merge pull request #7 from Circuitscape/tanmaykm

merging all refactors from branch to master
Have a common version file.
Versions still have to be bumped by hand in Makefile and .iss files.
Rename TODO to TODO.md
Add output directory in verify/ for tests.
Add author and email to csversion.py
Rename user_guide/ to doc/
Remove .svn
Experiment with travis
Experiment with travis
Use pip to install travis dependencies
pip does not work well with travis. Reverting to apt-get install
Disable travis notifications by email
Allow system site packages to be used in virtualenv

http://danielnouri.org/notes/2012/11/23/use-apt-get-to-install-python-dependencies-for-travis-ci/
Try pip again after virtualenv updates.
Do a pip --user install for travis
Some more tweaking of the travis setup.
-r is not a valid option for pip
Try pip in the install section of travis.yml
Remove --user option to pip as it does not help.
Attempt to use some other PPAs for numpy and scipy
Add scipy and numpy downloads. Use easy_install for pyamg.