Merge pull request #7 from jubianchi/master

Some quick fixes
Add an example on what the syntax could be
Update deps
Add Response asserter
Add Element asserter
Add Crawler asserter
Wires asserters to WebTestCase
Improve atoum & travis  configuration
Add headers assertion
Ad atLeast/atMost assertions & improve hasChild
Update README.md
CS Fix
Merge pull request #8 from jubianchi/custom-asserters

Improved test syntax with fluent API
add changelog
set minimum-stability to dev for atoum dependency
Merge pull request #10 from marmotz/master

set minimum-stability to dev for atoum dependency
it was a mistake
Merge pull request #11 from marmotz/master

Not useful, this information is useful only on root project.
Call to createClient is no more static.
Fix documentation, we have to require the app autoload, not vendor.