[Feature Request] Export to CSV

##  Here is what I would like to see new or change within PokeNurse

There are a number of things I'd like to see about the mons I have, far too many to put into columns in the app as-is.

It would be useful to be able to export a CSV with all the available columns.

Thanks!

## This is my environment

 - OS and Version: macOS 10.12
 - Version of PokeNurse 2.3.1
 
 
 
