[AIRFLOW-52] 1.7.1 version bump and changelog

Fix : Don't treat premature tasks as could_not_run tasks

Merge pull request apache#1422 from stranbird/conn-ui-revamp

Show `extra` data on the connection list view

Revert "Tasks references upstream and downstream tasks using strings …

…instead of references"

This reverts commit 6c1207b.

Revert "Tasks references upstream and downstream tasks using strings …

…instead of references"

This reverts commit 6c1207b.

Missing comma in setup.py

Missing comma in setup.py

version cap for gcp_api

v1.7.0

Merge pull request apache#1147 from r39132/master

Enhance CLI Test command to accept a JSON-formatted dictionary of par…