Micca

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* Swarm clustering algorithm added to ``micca otu``;
* ``micca.api.otu.denovo_swarm()`` function added;
* micca v1.3.0 includes: VSEARCH v1.9.5, MUSCLE v3.8.31, FastTree v2.1.8, swarm
v2.1.8;
* documentation updated.

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* Mow micca can generate plots with matplotlib when the ``DISPLAY`` environment
variable is undefined;
* ``MANIFEST.in``, Dockerfile updated.

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* Dockerfile added;
* Documentation improved.

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* Hits output file option added to ``micca.api.msa.nast()`` (``hits_fn``
option) and to the ``msa`` command (``--nast-hits`` option);
* setup.py improved.

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* Strand option added in ``classify`` (consensus-based classifier), ``msa``
(NAST) and ``otu`` (closed-reference and open reference OTU picking protolcols)
commands. Now these commands search both strand (default) instead the plus
strand only.

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* micca 1.0.0 includes: VSEARCH v1.9.5, MUSCLE v3.8.31, FastTree v2.1.8.