renamed to automatically execute test (hopefully), added test for bug #65
test for contig_lengths
Length is now calculated from the sequences, not kmer count. Fixes #65
had to adust these numbers since they are affected by the contig length coverage bug #65
fewer dimesions after contig length fix and fixed path to files
added few comments to load_composition test
Both numbers are taken from concoct, not calculated by hand
Merge pull request #66 from binnisb/develop

This fixes #65, with test. Awesome work @binnisb!