Extracted Status Class out of Collection
Extracted the Figure class from Collection
Refactoring of collection
Moved the existing exceptions and created two new ones #17

The Connection class now throws exceptions from the domain
instead of just passing on exceptions from RestClient.
Added Handling of indices not found #17
Refined README
Re-added Yard-Stick #15

* Dependency added
* Raketasks added
* Fixed all found problems except missing examples

Because of the missing examples, the coverage is not
100% - therefore the task was not added to the CI task.
This will be done as soon as I have added all the examples.
Updated Dependencies
Merge branch 'development' of github.com:mbj/ashikawa-core into devtools

Conflicts:
	Rakefile
	ashikawa-core.gemspec
	lib/ashikawa-core/collection.rb
	spec/unit/collection_spec.rb