Added options bar on the side and changed conversation page colors to a mixture of black and gray

I've added an options bar to the side to allow users to invite others, archive the conversation, and leave the conversation. I also altered the styling of the return to home option and made some color changes. We can change those later.

Here's a picture of what it looks like:
![options bar](https://cloud.githubusercontent.com/assets/5490475/3715139/6be8ca96-15d1-11e4-9651-383f422623d3.png)