Remove table from /rhn/configuration/ChannelOverview.do?ccid=1 task list

Make the list of tasks a list-group. Unlike the table is responsive. Do not use images as bullets but the font-icons.

before

![spacewalk configuration overview_old](https://f.cloud.github.com/assets/15332/2383176/f58f1ab2-a8f7-11e3-9049-6324c945faf2.png)

after

![spacewalk configuration overview](https://f.cloud.github.com/assets/15332/2383178/f9e5b9f4-a8f7-11e3-8e2b-f6f1fde8f5d4.png)