mdbackup v0.4.0-beta.1

• Added config validations using json schema.
• When uploading to cloud storage, compress and/or encrypt steps are done using actions implementation (avoiding duplicated code).
• Added more tests :)

Breaking changes:

• compression, encrypt and storages are now inside a cloud parent element.
• storages is called now providers.
• ftp and ftps providers now have port setting.
• sftp changed the setting from disableHostKeys to enableHostKeys.
• Action compress-gzip is now called compress-gz.