feedback via gitter

[arlin]

currently our instructions to users are to email us or use github issues to provide feedback.

a better approach might be direct users to gitter.

• go to https://gitter.im/phylotastic/phylotastic
• sign up for gitter and github if needed
• type "@\all, i have a { comment | question | feature request | bug report } on the mobile app"
• wait for someone to reply, then tell us

This way, we can discuss it with the user and write up the tickets ourselves. we'll probably get better tickets that way.

This would involve just

• changing instructions
• changing the embedded howto doc

[arlin]

already changed the instructions for testers.