Callforapapers compoenent

Description rendering made conditional, however the sample text to be decided if not present(right now the duration is given as sample).
Countdown timer and link to add new proposal is mentioned.

Here's a snap ->
![screenshot from 2014-05-22 16 41 09](https://cloud.githubusercontent.com/assets/3149236/3052969/f8d780dc-e1a1-11e3-9a49-8332a51da9cb.png)
![screenshot from 2014-05-22 16 41 56](https://cloud.githubusercontent.com/assets/3149236/3052970/f8d805fc-e1a1-11e3-9dac-f216fee1a56e.png)