Add Flapi's repository to the Dependencies section of README.md.

In order to get a Fluid application to compile and run you need to pull
in the Flapi jars. Unfortunately, they're not in one of the standard
repos. This commit adds a mention of the Unquiet repository to the
Dependencies section of the README.md file.
Merge pull request #1 from JamesIry/wip-1.0-dependencies

Add Flapi's repository to the Dependencies section of README.md.