Fix for #1309 - Twitter: Title should probably be a link

Hi. This is a fix for the following issue: duckduckgo/zeroclickinfo-spice#1309

**Changes made:**
[x] Added link to title
[x] Reduced font size of main text body for consistency with other instant answers

**What does the Instant Answer look like? (Provide a screenshot for new or updated Instant Answers)**

![twitter_instantanswer](https://cloud.githubusercontent.com/assets/2435916/5592824/3ef9c484-9229-11e4-9d44-169af02e583a.png)

## Checklist

[x] Added metadata and attribution information
[] Wrote test file and added to t/ directory
[x] Verified that instant answer adheres to design guidelines (https://duck.co/duckduckhack/design_styleguide)
[x] Verified that instant answer adheres to code styleguide (https://duck.co/duckduckhack/code_styleguide)
[x] Tested cross-browser compatibility

    Please let us know which browsers/devices you've tested on:
    - Windows 8
        [] Google Chrome
        [] Firefox
        [] Opera
        [] IE 10

    - Windows 7
        [] Google Chrome
        [] Firefox
        [] Opera
        [] IE 8
        [] IE 9
        [] IE 10

    - Windows XP
        [] IE 7
        [] IE 8

    - Mac OSX
        [x] Google Chrome
        [x] Firefox
        [] Opera
        [x] Safari

    - iOS (iPhone)
        [x] Safari Mobile
        [x] Google Chrome
        [] Opera

    - iOS (iPad)
        [] Safari Mobile
        [] Google Chrome
        [] Opera

    - Android
        [] Firefox
        [] Native Browser
        [x] Google Chrome
        [] Opera