Don't use tracker_urlform if it's None
Adding CONTRIBUTING.md
Merge pull request #151 from Aaron1011/urlform_fix

Don't use tracker_urlform if it's None
Merge pull request #149 from Aaron1011/contribute

Adding CONTRIBUTING.md
Added link to Jira on project edit page
Merge pull request #150 from Aaron1011/jira_link

Added link to Jira on project edit page
add missing </a> tags