find free port for phantomjs at runtime
keep using arrow 0.0.77
add error checking
fix lint errors
Updated README with instructions to explicitly request the master branch.
Removed note on globally installing Mojito, which is now impossible.
Merge pull request #1186 from zhouyaoji/docs_update_faq

[doc] Removed note on globally installing Mojito, which is now impossible.
correct more jslint errors
Merge pull request #1182 from lzhan/yui

keep using arrow 0.0.77 and find free port for phantomjs at runtime