Merge pull request #27 from blambeau/master

A few fixes for ruby 1.9.3
Update docs badge in README

Update the URL of the docs badge to include it from inch-ci.org instead of inch-pages.github.io (the former being the successor of the Inch Pages project).
Merge pull request #31 from rrrene/patch-2

Update docs badge in README
Let the tmpdir be injectable.