WCP-326 : Adds telephony

This adds the super awesome 3rd party telephony to blackboard collaborate.

View of it in the session
![view](https://f.cloud.github.com/assets/3534544/2164671/eeec6ab0-94ee-11e3-8e4c-344caf8e2367.png)

Landing of the edit mode
![edit](https://f.cloud.github.com/assets/3534544/2164674/f89d5cea-94ee-11e3-8913-8a4d9665b45c.png)

Error handling on required fields
![validation-on-required-fields](https://f.cloud.github.com/assets/3534544/2164677/0826ae82-94ef-11e3-8f5d-319f4f327c3c.png)

Error handling when you have 3rd party telephony disabled
![validation-when-telephony-disabled-by-blackboard](https://f.cloud.github.com/assets/3534544/2164681/118c0b34-94ef-11e3-9f16-4c3d872e1661.png)