Improved Rails 3.2 compatibility. Console methods like app, new_session,
reload!, helper, and controller work as expected.
Rails 3.2 compatibility
For performance, enable pry-nav only on MRI 1.9.3 by default. To
use on MRI 1.9.2, add JazzHands.enable_pry_nav to a Rails initializer.
Due to buggy behavior, syntax highlighting as you type via
Coolline and Coderay is disabled by default. Enable
with JazzHands.enable_syntax_highlighting_as_you_type in a Rails
initializer. MRI 1.9.3 only.