Selection of multiple references

[apeltzer]

Title is pretty self explanatory. (@jfy133 asked for this)

Results directory could be along the lines of

eager_out
--| reference_1
----| sample_1
----| sample_2
----| sample_3
--| reference_2
----| sample_1
----| sample_2
----| sample_3
--| reference_3
----| sample_1
----| sample_2
----| sample_3

[apeltzer]

This would require having multiple reference genomes in a Channel and utilize them accordingly. Not sure if this is totally easy to do ;-)

[apeltzer]

Closing this in favor of the competitive mapping ...