Support adding Github issues from the chart

[bigfish24]

Summary

Right now the chart only displays issues if they have a start and end date. It would be cool to have a search function or some other way to select a Github issues that doesn't have dates and then add it to the chart, vs. having to set the dates in Github before it will appear.

Other links or relevant information

Roadmap Data

🗓 Start Date: 03-30-2017

🗓 Expected Date: 04-17-2017

🏷 Label: feature

📈 Progress (0-1): 0