Depend on phantomjs module so not have to install phantom separately
Edit documentation pertaining to installing phantomjs - this is no longer required as binary is included with phantomjs NPM module.
Merge pull request #9 from alanshaw/master

Depend on phantomjs module so not have to install phantom separately
Note that imagemagick must be installed to run tests
Merge pull request #10 from simong/master

Added a timeout option