Account Management

I'm taking the opportunity here to open this pull request for the account management branch so that both the code and the interface can be reviewed.

It's okay for this branch to still be considered a work in progress, and this PR will remain open as a place for discussion until it it's ready to be merged.

So this branch adds three new panels to the sidebar.

Settings:

![settings](https://cloud.githubusercontent.com/assets/47144/3386301/0f5f4056-fc73-11e3-87df-e6495c1e147b.png)

Profile:

![profile](https://cloud.githubusercontent.com/assets/47144/3386302/0f631910-fc73-11e3-9eac-a26a48f640ad.png)

Account:

![account](https://cloud.githubusercontent.com/assets/47144/3386300/0f5d2aa0-fc73-11e3-8d29-dae3f5a7f523.png)

@RawKStar77 if you've any thing to add, please do :)