Add workaround steps for installing libv8 and therubyracer.
Add workaround steps for installing libv8 and therubyracer.

 - add step for installing libv8 sepratelly with --with-system-v8.

 - add step to change therubyracer version from 0.12.1 to 0.10.2 in the Gemfile.

concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse