Add test helpers with superset assertion
Use helpers module for argument tests
Show commit data for tag sources
Add link for argument repos
Fix show_propositions option for arguments
Stop event propagation when title link clicked
Add show_discussions option for arguments
Encode reponames in argument title links
Fix tests for arguments without commits
Show form instead of empty discussions on init
Fix Argument#getCommitter()
Update changes file
Version 0.1.3