working on the book content rake task
finally got book content update task done
make book regen more efficient

- save shas of each chapter so we don't reprocess stuff that hasn't
  changed
- save directly to the database since we're running on the server now
- remove old remote task
- use logged in user so we have more API calls
actually remove old task
Merge branch 'book_rake'
remove heroku gem
force UTF-8 and add regen all option
drop fees text from sfc donation page

It used to be the case that Google Checkout would process
donations for free, whereas PayPal charged fees, and so we
pointed people to Google. As of July, Google now charges
approximately the same fees. There's no reason to prefer one
over the other.
Merge pull request #220 from github/sfc-donations

drop fees text from sfc donation page
move downloads of both installers to google code
change homepage
Merge pull request #221 from github/gcode-downloads

Move downloads links to Google Code
contributors redirect to github
downloads: point to the right download URL

The id tag does not point to the download url, but it's just some
identifier for the feed. The link to the file is buried inside escaped
HTML. Instead of trying to read it, figure out the URL ourselves from
the pattern they use.

This closes #222.
Merge pull request #223 from carlosmn/downloads

downloads: point to the right download URL
Update the list of available languages for the book.

The algorithm applied is quite simple:

1. Run `summary.rb` in the progit working dir
2. Languages with 99% or above are fully translated
3. Languages with 10% or above are partially translated
Merge pull request #225 from jnavila/update_book-langs

Update the list of available languages for the book.
Merge master into bump-newrelic-gem-version.