Resolve "HTML in event description is removed"

Gijs Hendriksen
2018-02-23T22:44:09+01:00

Closes #51

#### Previous behaviour
Event descriptions are just a single blob of text, instead of nicely formatted paragraphs. When an event description contains a schedule, for example, this makes the description ugly and hard to read.

Steps to reproduce:

1. Open an event with a description containing paragraphs, newlines or other formatting.
2. Notice that it looks like this:
![Inhousedag_Thales](/uploads/0515fda552e147b0337dc03ab58474d5/Inhousedag_Thales.png)

#### New behaviour
Event descriptions (passed as html) are parsed and displayed correctly.

Steps to validate that it works:

1. Open an event with a description containing paragraphs, newlines or other formatting.
2. Notice that it looks like this:
![Ouderdag](/uploads/fed72a010dc788d5d99f01440598e7ca/Ouderdag.png)