Cloud File Access

[nesquena]

This is an issue for adding a guide on how to access files living on user's cloud services. Links below:

• https://github.com/Ink/filepicker-android (powered by FilePicker.com)
• https://github.com/iPaulPro/aFileChooser
• File Picker Library List

Specific SDKS:

• Dropbox Android SDK
• Amazon Android SDKs