added sample with header response
renamed  to , made headers as array type, renamed  to
added url rewrite to make rests pass with java validator
added vendor as 'x-reverb'
changed from underscore to 'x-*' for vendor extensions
added common parameters test
Merge branch 'master' of github.com:reverb/swagger-spec

Conflicts:
	examples/mads/petstore-expanded.json
	examples/wordnik/petstore.json