use QtQuick.Window 2.2 to be compatible with Qt 5.8

RedisDesktopManager 0.9.0-alpha4 (redis#3781)

New features and improvements:
- Add initial implementation of Native Formatters (redis#3534)
- Add support for Pub/Sub commands in console
- Remove build-in zlib compression/decompression
- Remove php-unserialize.js formatter
- Remove msgpack.js formatter
- Update translations
- Improve connections dialog
- Remove qgamp and clean code
- Migrate to Qt 5.8
- Change breakpad origin to github

Fixes:
- Fix issue redis#3732: RDM shows invalid error message when trying to connect to invalid host/port
- Fix issue redis#3758: RDM Shows Key Values for One Key Only
- Fix tree rendering with multi-char NS
- Fix issue redis#3724: Load NS seperator from connection settings in NS deletion
- Fix redis#3691: RDM doesn't fade deleted keys & namespaces
-  Fix issue redis#3791: Model doesn't hide removed row on page > 1

0.9.0-alpha3 (redis#3762)

- Add Redis Cluster support
- Add Redis Sentinel support
- Fix issues with rendering in connections tree
- Update translations
- Add ability to change language in Settings dialog redis#3753

0.9.0-alpha2

* Implement server info tab
* Add basic translations support
* Update translations and messages
* Update qredisclient
* Fix links in WelcomeTab
* Use Helvetica Neue 12px as default font on OSX

Switch to Qt 5.7 (redis#3718)

* Switch to Qt 5.7

* Update configure

* Update .travis.yml

Fix regression in Connections Tree

NS context-menu doesn't open Bulk Operations Dialog

Fix regression in connection tree module (redis#3674)

Fix issue redis#3666

Update qredisclient

Bump version in appveyor

Update appveyor.yml