Fixed error in OSMManager constructor
- Use environment variable (TMPDIR, TMP, TEMP) for tile cache directory.
- Print selected cache directory in messages, rather than always "/tmp".
- Join cache directory with tile filename in an OS-portable manner.
Merge pull request #2 from sethoscope/master

temp directory fixes
Include a hash of the server URL in the cached tile filenames so that
if the client uses multiple servers, we don't give them cached tiles
from the wrong one.
Merge pull request #3 from sethoscope/master

Fix tile cache for multiple servers.
add setup.py
Rename README to README.md
Convert to MD, add pip instructions
Update using gibo
Merge branch 'master' into gh-pages