Merge pull request #13 from mfairchild365/master

Allow getting html errors via the api
Merge pull request #14 from mfairchild365/master

add an accessibility logger
Merge pull request #16 from mfairchild365/master

Add API example to readme
Merge pull request #17 from mfairchild365/master

UUse a custom useragent when checking links
add some details to the API documentation

Details include an explanation of what happens with `GET page html errors`
fix html errors
Merge remote-tracking branch 'upstream/master'