Urdubiometer

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* removed Markdown due to pypi errors, converted to RST
* fixes to CHANGELOG.rst due to bad conversion
* Adjusted setup.py to use find_namespace_packages

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* renamed DefaultScanner to GhazalScanner
* added basic Mir meters in settings/mir_meters.yml
* changed show_feet for missing Mir feet
* added with_mir parameter to GhazalScanner
* renamed default.py to ghazal.py
* rewrote constrained_parsers_of to allow for regular expressions in
constraints and to reuse already generated parsers
* added translations/urdubiometer/messages
* adjusted settings/constraints.yml
* modified scanner/validate.py due to regex use in constraints
* preliminary tie in with Transifex
* added scripts/extract_strings.py, scripts/import_po.py,
scripts/README.md
* adjusted .travis.yml
* added short long vowels to transcription.yml

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* fixed setup.cfg, setup.py, to correct bumpversion problem with single
quotes

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* added black code formatting

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* change to .travis.yml repo name
* added python 3.7 to setup.py

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* adjusted urdubiometer/\ **init**.py to fix **all** and import
* changed “id” in meters_list to string and fixed tests in
scanner/validate.py, settings/ghazal_meters.yml, test_scanner.py,
test_urdubiometer.py
* modification to doc structure (following earlier docs, needs
adjustment) Added
* added api.rst to docs (in progress)