Dataset Collections

[cwytko]

galaxyproject/planemo@fea51fc

I found these 'collections' to be fickle and based off one of the contributors to the galaxyproject only 3 or 4 tools use them, and to use these tools is beyond the scope of the unit testing. In good faith the dataset collections work.

[martenson]

Collections will be one of the key features of Galaxy in the upcoming years as the typical number of samples in most analyses rises quickly and cannot be handled without using lists/collections.

some more documentation here:
http://planemo.readthedocs.io/en/latest/writing_advanced.html#collections

[cwytko]

This particular error will not be fully be fixed until collections are a stable module to the galaxyproject