Add note about --auth being enabled for MongoDB

Now that MongoDB is started with `--auth` by default it makes sense to let people know that they can can advantage of this by adding users to the admin database if they want to test authentication.
add language: go to the go docs
Merge pull request #306 from TylerBrock/patch-1

Add note about --auth being enabled for MongoDB
Added Objective-C to index.md
Merge pull request #311 from Aaron1011/add_objc

Added Objective-C to index.md
New blog post on log processing.
API token => Access token
Some minor tweaks to make @joshk happy.
Merge pull request #312 from travis-ci/mm-log-processing

New blog post on log processing.
Fix permalink, add another example.
Fix example snippets.
Add notes about GOTO and Erlang Factory.
No https for pusher.com.
Bump Clang to version 3.2

see travis-ci/travis-cookbooks#114
Explain that Ubuntu 12.04 only includes Python 2.7 system packages
Merge pull request #313 from vterron/master

Explain that Ubuntu 12.04 only includes Python 2.7 system packages