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 #574 from rrrene/patch-2

Update docs badge in README
Fix typo in docs
Merge pull request #576 from rrrene/patch-3

Fix typo in docs
Move documentation of possibly_sensitive to update methods [ci skip]

Closes #577.
Alias URL_PREFIX to ENDPOINT for backward compatibility
Add streaming example [ci skip]
Merge branch 'master' of git://github.com/sferik/twitter