add tilestache-clean manpage
fix minus signs in tilestache-clean manpage
removing references to the old mapnik2 module
Switch 'requires' to 'install_requires' to fix dependency installation in pip
Add key_prefix option to Memcache cache.
Add pass_through mode to URLTemplate provider
Merge pull request #91 from perrygeo/master

Remove references to old mapnik2 namespace
Merge pull request #84 from andrewharvey/master

added tilestache-clean manpage
Merge commit '8c05d5c'
Merge commit '7f7b96bbd88a7ba6d6fa29afd49abb1aa84a41b2'
Changed Memcache key_prefix parameter to key prefix and added not to API.html
Merge commit '43bac72'
Replaced pass-through setting with an implicit pass on matching mode/format
Made image opening in Verbatim image wrapper slightly lazier