Basespaceapp

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- main takes arguments: arguments_with_content, arguments_with_items

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- globals()[payloadfunc] replaced with just payloadfunc

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- payload now a parameter
- >> python -m basespaceapp.main /data/ default_payload

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- wheel support

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- merged dostuff into payload
- payload now takes arguments : params_values, output_dir, scratch_dir
- config now includes ARGUMENTS_WITH_CONTENT and ARGUMENTS_WITH_ITEMS
- parse_appsessionparams now takes arguments arguments_with_content arguments_with_items with defaults from config

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- py3 support
- output_dir parameter
- sampleapp.py : almost same as basespace doc exmaple
- app.py now works
- ./tests/data/ with test data