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Python 3.x compatibility

Features
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* Added an option (--json-keys) to specify select keys that should be included in the JSON output. Useful if you only want a subset of the default JSON output file. Argument should be a comma-separated list of key names (v_gene,d_gene,j_gene,cdr3_aa)

Bugfixes
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* Fixed a bug when attempting to use a custom germline database that was named something other than one of the built-in databases

Add variable gene start position to minimal output

Update minimal output format

Tweaked Celery settings to allow for a broader range of chunksizes. Previously, chunksizes of more than about 1500 sequences would cause running jobs to exceed their visibility timeout and duplicate jobs would be queued.