Fix typo in the test for mixed case usernames.
Revert "add a test for the tsa url that doesn't linkify"

This reverts commit ad08ab3fa771b68566c8fcb438283bd227768176.

None of the twitter-text libraries pass this test. Removing it from the
conformance suit till the fix is implemented.
Merge pull request #65 from twitter/fix_autolink_tests

Fix autolink tests