add tests, start fleshing out jiraapi
Add URL for API class to use
add .gitignore
Bring in example graph code
just a bit of API doc
Start mocking up JIRA issues

jiraapi now emits some made-up issues. Soon it'll emit made-up dependencies too!
Refactor graph walking logic into JiraWalk
mockup JIRA links in JiraAPI
Add edges to JiraWalk
Support edges in JiraViz