Fix no-op set_epsilon()
Merge pull request #4 from smr547/master

Fix no-op set_epsilon()
Bump version, note changes, add AUTHORS.txt
Mostly non-functional cleanup for PEP8, typos, add missing doc, etc.

Also update setup.py so that it is an executable, and that
`./setup.py test` runs unittests.
Add from_world/to_world as discussed in #6
Move methods off class to module, and rename to loadsw/dumpsw

Also translate to/from center- and corner-based coordinates.
fix testing on errors
Merge pull request #7 from mwtoews/world-file

Add from/to world file support
Revert "Add from/to world file support"
Merge pull request #9 from sgillies/revert-7-world-file

Revert "Add from/to world file support"
Add loadsw()/dumpsw() world file support (#6)

Also, mostly non-functional cleanup for PEP8, typos, add missing doc, etc.

Update setup.py so that it is an executable.
Merge pull request #11 from mwtoews/world-file

Add loadsw()/dumpsw() world file support (#6)
Add travis config.

And little setup changes. Closes #10.