Update Ember teams info

[MelSumner]

This will be used in Issue #3131 to improve the teams page.

• [x] need twitter handles for everyone (or plan for what to do in lieu of twitter handles)
• [x] need descriptor sentences for each team- 1-2 sentences that explain what each team is primarily responsible for. I'm going to tag a few people in each team- please weigh in on the comments if you have a suggestion.
  • Ember CLI (@kategengler @kellyselden @Turbo87)
  • Ember Data (@dgeb @igorT)
  • Learning Team (@locks @jenweber @acorncom)
• [ ] need details for each team
  • [x] repo for the public meeting notes
  • [ ] what day/time are the team meetings
  • [ ] what is the best way to contact them