Fix manual and html documents for git upgrade.

Yesterday I missed this while submitting the PR to upgrade to
1.8.4.2. This was taken directly from the release information.
Merge pull request #25 from johnbellone/feature/git-upgrade

Fix manual and html documents for git upgrade.
Merge pull request #26 from johnbellone/master

Update Travis configuration to build 2.0.0
Fix SHA from my Emacs pinky.

The SHA are located:
https://code.google.com/p/git-core/downloads/detail?name=git-htmldocs-1.8.4.2.tar.gz&can=2&q=