extend http check with a --response-code check, to be able to check for specific response codes
Merge branch 'master' into review_140108_add_a_response_code_option_to_the_http_check

Conflicts:
	plugins/http/check-http.rb
whitespace fix
Merge pull request #411 from digitaltom/review_140108_add_a_response_code_option_to_the_http_check

extend http check with a --response-code check, to be able to check for specific response codes