Add analytics tracking for core actions

[joshsmith]

Problem

• [x] Clicked New Task
• [x] Clicked on Task Card in List
• [ ] Clicked Assign Task on Task Card (track organization, project, task)
• [x] Clicked GitHub Link on Task Card (track organization, project, task)
• [x] Clicked Install GitHub Application (track organization and project)
• [x] Clicked Connect with GitHub

[joshsmith]

We'll handle the last one here once @daveconnis finishes his work on task assignment.