DropBox support

Changes:

• DropBox suport
• upgraded look&feel

Improvements - suggestions

Changes:

• suggestions while adding new tags to resources
• grid view added for displaying resources
• Google Photos displayed in Google Drive view

Bug fixes:

• trashed files from g-drive not displayed in views

Bug fixes - min API set to 22 (5.1 Lollipop)

Minimum APK changed to support only Androids 5.1 Lollipops and above.

v1.0.0-beta - PoC

First release with support for Google Drive.