bump version to 1.6.0

Tidy share form, move decisions card to top of group page (loomio#4093)

* clean ups share form, move decisions to top of group page

* rename group_previous_polls_card to group_decisions_card

* add polls.group_id index and update counter migration

Bump minor version

bump version to 1.2.11

bump version to 1.1.7

bump version to 1.0.4

bump version to 0.20.218

bump version

Bump minor version

Merge pull request loomio#2597 from loomio/token-api

Remove API::BaseController, use API token for authentication