Use standalone version of 'JavaWriter'.

Available at http://github.com/square/javawriter/
Merge pull request #153 from square/jw/javawriter

Use standalone version of 'JavaWriter'.
Add link to QCon talk.

Also change the link colors to something a bit less awful.
Merge pull request #155 from square/jw/qcon

Add link to QCon talk.
Upgrade to JavaWriter 1.0.2. Drop now-duplicated method.
Merge pull request #156 from square/jw/one-dot-oh-dot-two

Upgrade to JavaWriter 1.0.2. Drop now-duplicated method.