Prepare animations for 1.1.2 (flutter#183)

[animations] Handle DualTransitionBuilder name conflict with flutter/…

…flutter (flutter#173)

* Handle DualTransitionBuilder conflict with flutter/flutter

Require animations package to use internal version of DualTransitionBuilder to avoid conflicts with flutter/flutter\'s recently merged copy of DualTransitionBuilder'.

* Update changelog and pubspec.yaml

[animations] Prepare for 1.1.0 (flutter#165)

* Update changelog and pubspec for new release

[animations] Prepare for 1.1.0 (flutter#165)

* Update changelog and pubspec for new release

[animations] Fix analyzer ignore location (flutter#110)

* Fix analyzer ignore location

[animations] Fix analyzer warnings (flutter#109)

* Update pubspec.yaml

* Update CHANGELOG.md

* Fix analyzer warnings

Refresh README (flutter#97)

* Refresh README

Fix pubspec.yaml (flutter#94)

Make pub.dev happy (flutter#93)

version 1.0 for package:animations (flutter#91)