change screenshotted reporting to false :)
changed filename format.

now filename contains the date and time, lexicographically.
Added sender's name to the filename.

now filename starts with the sender's name, followed by the date and time, lexicographically:
<sender>_yyyy-MM-dd_HH-mm-ss.<suffix>
Also created a new member method for creating the File object - DRY!
Merge pull request #1 from sebastianst/nogui

Nicer file naming