Fixes to work with setup.py.

- Fixed a typo in the graphite module in a function name.
Make the readme slightly easier to read.
Make tags based on storage-schemas.conf change from : to _.
Fix the setup.py, which was templated for a different project
Add support for only reading tags, added in kairosdb 0.9.2 or so.
Saves on traffic for getting retention info.
On Cassandra kairosdb only allows [A-Za-z0-9.-/_].

Change the tag for retentions to turn ":" into "_" and handle that
when reading and writing metrics.
Use fnmatch to get matching metrics.
Matching prefixes in the browser and dashboard.

This seems to cause the devel server to crash sometimes, and it does
that in ipython as well.  That can't be good.
Changed the semantics of how matches return in util.py, fixed how
they're received in graphite.py.
Remove extra print debugging messages.
Merge pull request #7 from pcn/dev

Merge in fixes to searching, etc.