Pytest-ngsfixtures

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Added some fixes that turned out to be necessary for optional performance.

* Add fixture that parametrizes over input parameters (37)
* Fix bug that returned wrong number of snakemake targets in application output generation (36)
* Add travis builds (35)
* Fix reference layout error for python 3.5 (34)
* Update option defaults (32)
* Expose fewer predefined fixtures via plugin (31)
* Unify parameter names (33)

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This is a major revision of the code. Several new abstraction classes
have been introduced to ease interaction with local test files, along
with new factory functions. For backwards compatibility, most factory
functions should work as previously. Documentation has been much
improved.

* Clarify fixture function naming convention (29)
* Expose bulk of factory inner functions (24)
* Create separate module for os-related functions (27)
* Use separate conda build statements to build for different python versions (23)

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* Add pool fixtures (22)
* Add safe_copy function (21)

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* Change name to pytest-ngsfixtures (20)
* Add bcftools versions 1.4, 1.4.1, 1.5, 1.6
* Add bowtie 1.2.1.1

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* Add star application
* Add vsearch application
* Add rseqc application
* Add snakemake dependency
* Update docs

* Separate qualimap pe and se output (12)
* Add mapdamage2 (11)
* Fix mapdamage2 missing output (18)
* Use realpath to determine download url (17)
* Rename download_ngsfixtures_data.py to pytest_ngsfixtures_download_data.py
* Update versions for samtools

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* Add picard output data
* Add functions for dealing with application fixtures
* Move docs to gh-pages
* Add pytest_ngsfixtures_add_application.py for templating new
applications
* Application outputs now implemented as dictionaries for
multiple-output applications