content views - support retrieving 'readable' versions

A small change to add an authorization to allow users to
retrieve content view versions that are 'readable' within
an organization.
content views - add a portlet to the dashboard for content views

This commit contains changes to add a portlet to the dashboard for
content views.  The portlet will be similar to what is available
for promotions.

It will essentially list the last N (e.g. 5) content view
publish/refresh attempts.  Indicating 'publishing' or 'refreshing'
while the view action is being performed.  Once it is finished,
it will display success/failure with a timestamp.  The user
may also click on the view name (if they have permissions)
and be redirected to to the content view definition where
that view exists.
content views - haml for dashboard portlet
adding iptables -L output to the katello-debug
Standardizing notification message for re-using Labels. Fixes #1718
Showing invalid label as error not exception. Fixes #1721
Merge pull request #1719 from omaciel/standardlabelnotif

Standardizing notification message for re-using Labels. Fixes #1718
Fixes #1658 - Removes all user notifications regarding login due
to redundancy and adds a helptip style message on the dashboard
for users without access to any organizations to let them know what
their next steps are.
Merge pull request #1723 from ehelms/issue-1658

Fixes #1658 - Removes all user notifications regarding login due
Merge pull request #1722 from daviddavis/1721

Throwing error on bad label and not exception
Merge pull request #1710 from lzap/debug-iptableas

adding iptables -L output to the katello-debug
adding ruby193-rubygem-hpricot to el6 comp
Merge pull request #1727 from lzap/comps

adding ruby193-rubygem-hpricot to el6 comp
adding two more deps to el6 comp
Merge pull request #1728 from lzap/comps2

adding two more deps to el6 comp
Merge pull request #1697 from bbuckingham/fork-content_views_dashboard

content views - add a portlet to the dashboard for content views
adding logging deps to el6 comp
Merge pull request #1730 from lzap/comps3

adding logging deps to el6 comp
Setting rubygems to 1.8 in travis to fix ZenTest

ZenTest 4.8 requires rubygems ~> 1.8