BUG: twitter.js: add parentheses to linkify regex

Steps to reproduce:

* Input: https://en.wikipedia.org/wiki/Lincoln_(2012_film)
* Output: https://en.wikipedia.org/wiki/Lincoln_

This patch adds parentheses to capture groups 2 and 3.
Merge pull request #189 from westurner/expand_tweet_link_regex

BUG: twitter.js: add parentheses to linkify regex