Add Firebase Storage Components

[phidias51]

There's a firebase-storage script in Polymerfire, but no GUI widget that allows users to simply drag and drop a file or list of files and load them into storage. It would be useful if:

• We had a storage upload GUI component that lets the user drag and drop a file or list of files, and load them into firebase storage. There should be a way for developers to listen to file upload progress. It would be nice if there were also an optional component that provided users with upload progress information.

• We had a storage view GUI component that lets the user see the files that have been loaded into storage at a particular URI.

This would give users an experience for firebase storage that's similar to Google Drive.

[FluorescentHallucinogen]

@phidias51 See #226.

[FluorescentHallucinogen]

This issue can be closed, because pull request #226 has been merged.

[phidias51]

Does that mean that the task elements are visual components? Does the storage element let you drag and drop files onto it? If not, the issue should remain open.

[tjmonsi]

@phidias51 I think polymerfire is not really for creating visual components but just helper tags to use in your Polymer elements. So I am not sure if polymerfire would go to the direction of creating visual components because like it's other parts: firebase-query and firebase-document, firebase-storage components don't have GUI as well