Extensive refactoring of Score and Feature constructor API

[standage]

The original Feature constructor was optimized for instantiating objects from GFF3 data. Static factory constructor methods were duct taped on later, but after using these for a while it's clear things are backwards. This update changes the API so that the default constructor requires a sequence identifier, feature type, and genomic coordinates. The static method create has been dropped and the static method from_gff3 has been added. Various other getter/setter methods were updated, and the API of the Score class was also updated.

• Full test coverage? Any additional tests that could easily be added?
• API documentation up-to-date? Docstring examples?
• Is the CHANGELOG up-to-date?

[codecov-io]

Codecov Report

Merging #74 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #74   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          23     23           
  Lines        1281   1269   -12     
  Branches      287    290    +3     
=====================================
- Hits         1281   1269   -12

Impacted Files	Coverage Δ
tag/__init__.py	100% <ø> (ø)	⬆️
tag/feature.py	100% <100%> (ø)	⬆️
tag/reader.py	100% <100%> (ø)	⬆️
tag/locus.py	100% <100%> (ø)	⬆️
tag/score.py	100% <100%> (ø)	⬆️

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