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.
Also conditional rendering for countdown timer and the button, based on cfp open or not.
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)