Streamline build and Travis config

* Create new Travis-specific targets in the Ant build file:
`travis`, `travis:checkdb`, `travis:db:nuke`, and `travis:test`
	* Note: `travis:test` now runs **all** tests
* Ensure `db:nuke` gets run before each Selenium suite on MySQL
* Don't fetch Firefox or NodeJS by default
* Also, fix broken streaming spec
Merge pull request #8 from anarchivist/streamline-travis

Streamline Travis build