- Automatic update of doxygen docs, triggered by buildbot

- Replaced bitbucket links with github ones in README

(grafted from 14e2ded5ddb3609dfd9b3d56dee68503728ddf0a)

- Updated setup to fectch external dependencies from github

- Updated .extern accordingly
(grafted from 1fb1af4f71af691e67eff28bf0b4651a7c09eb03)

- Updated CHANGELOG

- Updated AUTHORS
- Updated READMEs

- Updated READMEs

- Updated CHANGELOG & README for 1.8 release

- Updated CHANGELOG for 1.8rc0

- Prepared for 1.7 release

- Updated CHANGELOG, config headers and READMEs

- Merged with webp branch

- Fixed doxygen package command in buildbot script for buildbot 0.8.10