refs #252 - better error handling for form.fill()
added CONTRIBUTORS
fix up one use of qsa, verify the length of the returned array when checking for empty.
updated CHANGELOG
updated gemspec requirements
Casper.resourceExists() now checks for non 404 HTTP status
a commit with no missing file is not really a commit, is it?
First tests
Expected headers on server request
Adding one more test
Providing `getCurrentHeader` and `getCurrentHeaders`
Missing breakpoint in loop
Tests for the new API
Implementing the new API
Case insensitive tests
Making stuff case insensitive
Testing response as argument of step function
Implementing response as callback parameter
Testing back in currentResponse
http module