Added search by keyword (Keith and John)

Implemented the search by keyword feature and added appropriate rspec
and cucumber tests.

Additionally, we installed rspec for the project and added simplecov.

As part of our testing, we needed to add the gem capybara-webkit. This
gem requires that qt is installed on your system. For our cucumber tests
to pass on your VMs, you first must run the following:

    sudo apt-get install libqt4-dev

For more detailed instructions, you can look here on their wiki:
https://github.com/thoughtbot/capybara-webkit/wiki/Installing-Qt-and-compiling-capybara-webkit