Issue 148

Visualizations now include data about Emperor
    
Each visualization is now tagged with 10 lines where information about the creation of the file is included. This information will point people to the version of the libraries that were used to create the files as well as the date an which exact command was executed.

I decided to not include the MD5 sums of mapping files and PCoA files because this would add a lot of overhead to the creation of the visualizations. Specially for some of the bigger datasets.