Refactor File API for Dropbox support
Remove Zap and Shake/Slide and share demo hack

Jira issue: WP-44
Multiple file systems (incl. Dropbox file system)

Jira issue: WP-44, WP-601, WP-694
Update some old links
Fix put zero body bug
Remove default shares
Merge remote-tracking branch 'upstream/master' into multiple-file-systems

Conflicts:
	package.json
	webinos/core/api/pom.xml
	webinos/core/util/lib/configuration.js
No longer set getPath param
Merge pull request #490 from felixjendrusch/multiple-file-systems

Multiple file systems