added versioning code and a version #
added version stuff in setup.py
Fix print statements in demo_print_region.py for Python 3
Declare that pyregion supports Python 3 in setup.py
Update pyfits to astropy.io.fits in test scripts
Add entries to .gitignore
Change to public submodule URL in .gitmodules

This is needed to make pyregion testing on travis-ci.
See travis-ci documentation here:
http://about.travis-ci.org/docs/user/build-configuration/#Use-Public-URLs-For-Submodules
Add .travis.yml for testing on travis-ci.org
uses __builtin__.open
Merge branch 'version' of https://github.com/keflavich/pyregion
workaround matplotlib backward-incompatible change. closes #15.
fix undefined _open_builtin error
Merge branch 'python3' of https://github.com/cdeil/pyregion
Merge remote-tracking branch 'cdeil/travis-ci'
use exec instead of execfile for py3 compatibility
revert 7af14ef and do not use __builtins__ which needs py3 change
travis build pywcsgrid2 from github master
add plot_directive_v3.py
fix import statements for py3 compatibility.
update setup.py for install requirements