Documentation Error: Query#by_example
Ruby version bump
Devtools Sync
Enable flog on 2.0.0 instead of 1.9.3
Variable name `_` is communicative

It has special meaning in Ruby. It is the only one letter variable
name that is communicative, so I adjusted the RegEx.
Reek: Will refactor those two later
Rubocop adjustments
Devtools Sync
Travis Configuration

* Run 1.4.2 on Travis
* ArangoDB Install Script adjusted
* Adjusted Rubinius Version and made it an allowed failure
* Deactivated builds with authentication for now
Bumped minor versions of all dependencies