Safer monkey-patching of Pry.start/.teardown
Allows other plugins to do the same without triggering a SystemStackError.
update dependency for most recent pry release
eliminate need for separate require 'pry-nav', closes #9
* Pry loads the cli.rb for a plugin at startup, rather than at Pry.start(). By adding this file we ensure that pry-nav's monkeypatch applies without requiring an additional require 'pry-nav' by the user.
prevent pry-nav turning on the tracer for non-bindings