Initial Import

Signed-off-by: Chris Aniszczyk <zx@twitter.com>
Add twitter-text-conformance submodule.
Do not use '_' prefix for private methods.
Use NFC to count characters in tweet.
Add remainingCharacterCount: method.
Changed public method names to conform to Apple's naming guidelines.
Add To Do in README.
Fix typo.
Small refactoring.
Use getCharacters:range: instead of getCharacters:
Fix short URL length.
Twitter does not allow quotation characters before an URL

URLs cannot have a proceeding character of U+0022 (QUOTATION MARK) or U+0027 (APOSTROPHE). This behavior can be observed in the Twitter API, and Twitter web character counter.
Merge pull request #2 from aki-null/twitter-text-objc

Twitter does not allow quotation characters before an URL
Do not allow '!', '_', '-', '=', '.' and '/' as a URL preceding character.

This behavior is observed twitter.com.
Revert "Do not allow '!', '_', '-', '=', '.' and '/' as a URL preceding character."

This reverts commit bd8ea3302266b02f692b4fa45dfaa2f208320efc.
Revert "Twitter does not allow quotation characters before an URL"

This reverts commit 8427cddee75c120947b3bcf703f9b681b9f1eaa1.
Add cashtag support.

Use NSMatchingWithoutAnchoringBounds when matching with primary regexp.
Upgraded to the latest conformance suite
Make tweetLength to calculate characters using short URL length.
Add link to author's github account.