add getter for response object

so people may introduce their own assertions
add assertions for response header
add assertion for json subset
adjust whitespace to psr-2 standard
adjust whitespace to psr-2 standard
adjust whitespace to psr-2 standard
adjust whitespace to psr-2 standard
Merge branch 'addgetter'
Merge branch 'check_json_subset'
Merge branch 'fix_print_response'
Merge branch 'check_response_header'

Conflicts:
	src/Context/WebApiContext.php