Add specs for #servicename.
Add #servicename.
Fix XPath expression.
Really fix XPath expression.  Pass all specs now.
Hook it up into Wasabi::Document.
ignore undefined extension base elements. close #23
Issue #21: HTTPError improvements + spec

When the resolver gets an erroneous response (such as a 404), raise
an HTTPError with:

- `message` set to "Error: 404" (or whatever the code is)
- `response` set to the original response object
Merge pull request #24 from a-e/master

Fix for issue #21
updated the changelog [ci skip]
Merge branch 'servicename' of git://github.com/keltia/wasabi into keltia-servicename
renamed #servicename to #service_name /cc #22
updated the changelog [ci skip]
preparing v3.1.0
found several major speed improvements /cc #7
updated old urls [ci skip]
we don't need this [ci skip]
added badges to the readme to monitor improvements
don't require method_profiler for 1.8
added coveralls
specifically pass the namespaces used for xpath

passing namespaces which are not used in the query slows down the search.