Tweak to the README

Not sure if this is necessary, but it seems that calling
DbWrapper.connect() is the magic that really makes things happen.
Tweaked the README to show where that might take place and included the
info in the list of API functions.
Merge pull request #9 from mlaccetti/master

Updated the README to include connect() info
Add Travis.ci hook
README & .travis.yml update
* DB setup must follow Travis CI requirements
* added Node.js 0.6 to .travis.yml
PostgreSQL driver now returns JS dates
* README update
* Unit tests fixes
Misc Unit tests fixes & optimizations
Travis CI tests passed successfully
 * misc Unit tests fixes & optimizations
 * add Travis CI build status in README.md