[CHEF-3818] Remove the gemspec as this is a Rails application

The previous commit (88fbb11bf1) bump the Rails version in this gemspec
but missed bumping the Rails version in the Gemfile. As this is a Rails
application the gemspec is non-idiomatic and all dependencies should be
declared in the Gemfile (and locked in the Gemfile.lock). Removing this
gemspec now to save future confusion.
[CHEF-3818] Gemfile lock rails ~> 3.2.11

Update includes patch fixes for CVEs disclosed january 2013.

See also:
http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3-0-19-and-2-3-15-have-been-released/
Remove `version` references

It is easy for this version number to become outdated and doesn't really
make much sense in the context of Ommnibus-based Chef 11 Server. The
proper `chef-server-webui` version can now be obtained from the version
manifest that ships with Chef Server 11+.  This can be found at:

    /opt/chef-server/version-manifest.txt
pessimistically lock to 11.0.0 version of chef gem

The webui uses the chef gem as a REST client for accessing the backend
Erchef API.