Print exception tracebacks.
Updated plugins with scripts.
Updated program description.
Improved documentation.
Add DrMcNinja.
Fix comic searching.
Add firstStripUrl for KevinAndKell.
Add Schuelert
Print stacktrace on image errors.
Retry failed page content downloads (eg. timeouts).
Bump up version.
Only 1 test for travis.
Updated changelog.
[ci skip]