Biomart

v0.8.0, 01/10/2015 -- New design of classes, new way of fetching attributes and filters for datasets. Still need to figure out the actual need for virtualSchemaName, for now 'default' is used for all datasets.
v0.9.0, 07/04/2016 -- The module is now aware of AttributePages and will check whether selected attributes all belong to the same page. thanks to krassowski for his work.

v0.6.0, 04/06/2015 -- fixed issue with using the 'default' virtualSchemaName. Now fetching it from the registry. Using default attributes from the first visible attributes page to prevent a biomart exception from being raised (cannot use default attributes from multiple attribute pages).