Add support for relative sanboxed calls

1.0.4

Update README.md

Add option to make several calls in a sandbox

1.0.3

Fix whitespace

Make all exceptions implement a common interface

1.0.2

Make all exceptions implement a common interface

Add exists() and dirExists() methods to ClientInterface

1.0.1

Better explain differences with original library

Initial (pre)release

1.0.0

Ignore IDE settings