Adding gemini-gui for HTML reports

[sergesemashko]

@conortm @ericduran please review.

Here is the list of commands should be executed on PR environments:
Phantomjs should be running In parallel thread:

phantomjs —webdriver=4444

Gemini commands:

• cd <project>/prototype/
• gemini gather gemini/ — generate initial collection of screenshots being compared to. This command can be executed on PR environments for now as image. This task can be moved to another environment later and images will be copied from master branch environment.
• git merge <pull-request-code> - apply code from Pull Request
• gemini test —reported flat —reporter html gemini/ — take another collection of screenshots and compare them against initial set of images, generate Flat and HTML reports
• ln -s <project>/prototype/gemini-report <project>/docroot/gemini-report -- making gemini-report accessible for PR environment via URL like http://..com/gemini-report

[rabellamy]

See #194