Correct bad text completion...

Stupid Brackets thought "$con" was "$convert_cyr_string"
Bring back the old error message.

Commited without removing some debug output
Allow GitHub Gists in both scripts and style
Correct half-comment.

Somehow missed a '/', which was causing script to not execute.
New string prototypes & add optional withCredentials to ajax()

New string methods: contains(), startsWith(), & endsWith()