appbar color fixes

fixed color choosing in appbars

Appbar fixes

Fixed incorrect colors in appbar. And fixed title alignment when only trailing or leading is defined

Exposing trailing and leading appbar buttons.

1.0.8

exposing leading and trailing appbar buttons

Exposing field for adding Refresher

1.0.7

fixed refresh

1.0.5

bug fixes with controllers and added Prior widget for additional customization

1.0.4

fix bugs with focusnodes and transparent system status bar

Fix bug with dispose()

Merge pull request #7 from durbek03/fix_focusnode

bug with focusNode dispose() fixed

Adding demo videos

Added demo videos for README.md

Initial release

Initial production ready release.