Pascal Jungblut

Add Boost as a dependency

3

We could eliminate much of our code if we just used Boost, e.g. much of the iterators and const-correctnes stuff @rkowalewski is currently working on. This PR adds the dependency...

Allow email delivery with sendmail.

Editing config files is not very user friendly. It should be possible to fire up Disgo and configure it in the web browser, like for example [gogs](https://github.com/gogits/gogs/) does it.