Imfusion

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* Properly added star-fusion support to star aligner (was previously not
fully merged).
* Changed documentation URLs to new repository.

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* Several small fixes for Python 2.7 compatibility.
* Fixed issue in CTG test that occurs when no insertions are within the
gene windows.
* Replaced usage of deprecated .ix indexer for pandas DataFrames.
* Updated documentation.

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* Refactored external tools into the ``imfusion.external`` module.
* Use docker/tox for testing against multiple Python versions locally.
* Added additional checks for inputs and improved error messages.
* Added support for DataFrame insertion inputs to DE testing functions.
* Added building of exon gtf as part of imfusion-build.
* Added identification of endogenous fusions using STAR-Fusion as part
of imfusion-insertions (using STAR). Also adds script for building
(murine) STAR-Fusion references.
* Made matplotlib/seaborn lazy imports that are only required when actually
using the plotting functions. This makes IM-Fusion easier to use on
headless servers/HPCs.

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* Added support for the STAR aligner.
* Added detection of novel transcripts using StringTie.
* Changed reference building to generate a self-contained reference.
* Refactored differential expression tests + added gene-level test.

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* First release on GitHub.