Correctly set Content-Length when using Ruby 1.9

[mikedouglas]

The meaning of String#length changed between 1.8 and 1.9. This commit clarifies that Content-Length is the number of bytes, and monkey-patches String#bytesize into 1.8.

I think the default setup for Heroku is now Ruby 1.9, so it makes sense to ensure that Toto works with it.

See #91, #86, etc.

[ixti]

Man! Nice! I was too lazy to get into deep of the problem :)) Thanks for solving it (will merge your patch into mine branch) Woo-hoo! :))

[ghost]

See also #10: index.builder Generating partial feed (xml is truncated)