Include web-console in new projects Gemfile

As part of  the Google Summer of Code 2013, me and @guilleiguaran has been working on bringing `rails console` to the browser. Today we are proud to announce that we hit `0.1.0` and we have enough of it, to let you guys test it.

The project development lives in https://github.com/gsamokovarov/web-console and we'll be happy to get any feedback about how we can make it better. That this is more of a demo release and we will really appreciate all of the extra testing we can get. Feel free to open issues on https://github.com/gsamokovarov/web-console/issues with any bugs,  feature requests or general feedback.

/cc @guilleiguaran, @rafaelfranca, @pixeltrix, @spastorino, @drogus