Merge branch 'release/0.3.10' into develop
Fix writing screenshot file
Added test for capture screenshot - test if file exists and is png file using imghdr, then delete file
Merge pull request #23 from Hellspam/develop

Fix for writing screenshot file
Update test_capture.py

use absolute path, so test could be run from any current running directory
Update test_capture.py
Version bump, created created release package.
Merge branch 'release/0.3.11'