Whitelist a few inline styles - exclude more empty elements

<img> tags should have height and width attributes.  Iframes too, I
guess.

Allow only void elements to be empty - highlight error to any other
empty element.
Adding npm module information
selenium-webdriver module
selenium-webdriver module
selenium-webdriver module
Merge pull request #171 from pranavparikh/master

Adding error callback when screenshot is not generated, jslint fixes and removing nodejs 0.6 build from Travis
Merge pull request #172 from pranavparikh/reportingFix

Fix for test session count in case of multiple browsers
Merge pull request #174 from pranavparikh/master

Fix for json report
Merge pull request #170 from imbrianj/master

Whitelist a few inline styles - exclude more empty elements
fixing conflict
Merge branch 'master' into reportingFix