Jettywrapper should explicitly require 'active_support/benchmarkable'

[cbeer]

Lovely failure if you aren't in a Rails environment (with autoloading) already:

NameError: uninitialized constant ActiveSupport::Benchmarkable
/Users/cabeer/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/jettywrapper-1.8.2/lib/jettywrapper.rb:19:in `<class:Jettywrapper>'
/Users/cabeer/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/jettywrapper-1.8.2/lib/jettywrapper.rb:16:in `<top (required)>'

[atz]

Added dep to gemspec in https://github.com/sul-dlss/jettywrapper/commit/a26a7861c93c3e56ff4cf2faf8d6f38ae1260bab