Use a custom useragent when checking links
Merge remote-tracking branch 'origin/master'
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'
add install information
Merge branch 'master' of github.com:unl/batchvalidator into blow_your_row
Fix command line typo.
Formatting.