bump version to 0.9.13

add release notes for 0.9.12

bump to 0.9.11 for realzies

Fix unsafe use of pickle.loads

Respect tz query param earlier in the render view

Closes issue graphite-project#131

Rev to 0.9.10 final

Fix typo on merge

Rev to 0.9.10-pre4

Rev to 0.9.10-pre3