Possible fix for bug 913 -GRASS Backend multiple
UTF-8 default encoding fix

Without this fix, it was not possible to request non-base64-encoded
binary files (images as well as zipped shapefiles) as output of GRASS
processes.
Refactored stream reader
Added image/geotiff mimetype to genericfileparser
Removed unused functionality
Switched back to plain welcome page...

... adjusted logo URL for test page.
Some refactoring of the GRASS 7 backend.

Fixed a bug in GenericFileData with unzipping files.
Merge pull request #42 from bpross-52n/master

Switched back to plain welcome page, some refactoring of the GRASS 7 backend.