Bounty emails

Whaaaasssup peeps!

I want emails out of hilander, so here's two I've made while waiting for CI to build my work.

## Bounties

Bounty emails are sent every 10 minutes rolling up the new ones in that time per clan, so we're not spamming users about every new bounty.

`thor emails:bounties`

![_hilander__new_bounties_offered_in_envato___sean st quentin_envato com__all_mail_](https://f.cloud.github.com/assets/21491/2046823/82944c1c-8a0c-11e3-860c-1c11bf526ec9.png)

## Leaderboard

Sent once a week, on Friday.

`thor emails:leaderboard`

![current_leaderboard___sean st quentin_envato com__all_mail_](https://f.cloud.github.com/assets/21491/2046824/91007762-8a0c-11e3-90ff-84db84cce370.png)