Delta Mode

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

Initial Release

The first initial release. Should be able to download stuff not really tested. If no new commits follow soon, then it probably is stable.