Add genshi dependency of bioformats for 5.0.0 and above
Update Bio-Formats version to 4.4.7
Update OMERO version to 4.4.7
Merge pull request #28 from sbesson/4.4.7

Install 4.4.7 versions of OMERO & Bio-Formats
Merge pull request #27 from sbesson/genshi_dependency

Add genshi dependency of bioformats for 5.0.0 and above
Bump OMERO & Bio-Formats versions to 4.4.8
Merge pull request #30 from sbesson/4_4_8

Bump OMERO & Bio-Formats versions to 4.4.8