Switch from using react tools to esprima-fb parser

[mikesherov]

JSCS 1.8 is out now with the ability to specify a variant of esprima. FB maintains esprima-fb which parses jsx files. This package should be basically equivalent now to gulp-jscs except automatically specifying the esprima-fb as the parser.

[agschwender]

Thanks for reaching out and sorry for not replying sooner. Just switched it over to use esprima-fb instead of react-tools in 620def3. All the tests pass except for the test that handles flow types. The module is using react-tools to strip them out before parsing. Did a quick search and didn't see anything promising for achieving that without react-tools, but I'm certainly no expert. Do you have any recommendations for having jscs ignore these? If not, no worries; they should probably be getting stripped upstream.