Revert "Update phantomjs gem 1.9.2.1 -> 1.9.7.0"
Revert "Update phantomjs gem 1.9.2.1 -> 1.9.7.0"

We have been seeing a lot of broken icon fonts after we upgraded
PhantomJS. Reverting that upgrade for now.

This reverts commit 902523113fc37d3ec5251ec4d12d9ad59464341f.

diffux/diffux,kalw/diffux,kalw/diffux,diffux/diffux,diffux/diffux,kalw/diffux