Added DropboxUploader::uploadString() method to upload a string as file.
Fix: Close curl handle before throwing Exception
Fix: Remove superfluous method parameter in request()
Fix: Email and Password are strings and must not be empty
Streamline code-formatting and Typography

- Code-formatting and Typography
- Dropbox configuration removed magic numbers, now class constants
- Uppercase constants
- Code arrangement in extractToken()
Version bump v1.1.9
Merge pull request #12 from hakre/development

Maintenance v1.1.9