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' into develop
Merge branch 'release/0.3.11'
copy the desired capabilities object to prevent modifying the global instance.
Log info about the remote node.  (so testers can use it for trouble shooting their grid setup)
updated change log and bump version numbers.
Merge branch 'release/0.3.12' into develop
Merge branch 'release/0.3.12'
Make logging remote web driver properties false by default.  (to avoid polluting log files)
minor edit to readme.
put the print statement inside a try/except block incase nonstrings gets embedded into exceptions.
version number bump
version number bump
Added travis CI build status badge.
use os.join for file path.