wip/phantomjs upgrade needed to avoid X dependency

http://code.google.com/p/phantomjs/wiki/FAQ explains that 1.5 onwards
phantomjs is pure headless, requiring no X.

Current wip version is 1.4 while the latest is 1.6.

Please post if there are any known issues in upgrading or if anyone is
trying that out. If nobody is currently trying out, I'll give it a try to
upgrade.

Mayuresh

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