Version bump to 2.3.0
Add capistrano task.
Corrects SeedFu::Writer URL in README.md
Run :seed_fu only on primary db server.
Remove hook, put it into the example in README.md.

https://github.com/mbleigh/seed-fu/pull/56/files#r7623608
SeedFu::Writer URL is now relative
Merge pull request #57 from dleve123/master

Corrects SeedFu::Writer URL in README.md
Merge pull request #56 from linjunpop/capistrano

capistrano integration