Added new features:
- localDir and remoteDir flags: allow to specify a remoteDir separate from the basePath which might always be needed and a localDir where the downloaded files are put
- deltaMode: allows to download only files which do not exist already locally or have different size or different modify date
Fixes over version 0.2.0:
- fixed some errors when downloading folders without subfolders
- fixed some bugs in delta mode
- created release.sh to build binaries for Linux and Windows