Updated raygun.js to report AJAX response data

Added the response text to the error report when an AJAX call fails.
Closes #67
Added slice to responseData to match requestData
Update raygun.js

Updated field filtering to filter the value of the field rather than the field itself.

Closes #70
Merge remote-tracking branch 'origin/pr/68' into v1.11.1
Build & update to v1.11.1
Merge pull request #72 from MindscapeHQ/v1.11.1

V1.11.1