Fixed crypto version requirement. Latest in pipi is 1.0.1, not 1.1.0.
Install more generic postgresql packages now that 9.x has been around for a while
Merge pull request #305 from daveross/feature/updated-install-docs

Install more generic postgresql packages
Merge pull request #304 from daveross/bugfix/crypo-requirements

Fixed crypto version requirement. Latest in pipi is 1.0.1, not 1.1.0.