download without given dirstruct for ftp and sftp
download without given dirstruct, apply download filter
Merge pull request #18 from IsabellaP/develop

Develop
bugfixes in download
added base class for images
removed bugs that occured on usage of custom shapefile
added module to unpack compressed archives
added reader for hdf5 file format
implemented scaling_factor for hdf5 files
bugfixes
bugfixes in download routine
bugfixes in web app
added default host and port for web app
fixed but with metadata attributes
updated resampling method
added separate download and resample methods
fixed bug that occured if app didn't run at port 5000
formatted code to be pep8 compliant
removed bug that occured on averaging of images.
formatted code pep8 compliant
fixed bug that occured on writing metadata to netcdf file