Get-reader

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* Added `from_sql()` constructor to read database tables or SQL results.
* Added support for `Series`, `Index`, and `MultiIndex` objects to the
existing `from_pandas()` constructor.
* Added a `Reader` class to provide consistent return values and automatic
resource-handling (for closing files, database cursors, etc.).
* Changed all constructors to return `Reader` instances.
* Fixed file-closing behavior when DBF files are not fully consumed.
* Changed `from_datatest()` to `from_squint()` to reflect new package name.
* Added Python 2 support statement to README:

> While official support for Python 2 ends on January 1, 2020, this
> project will continue to support older versions as long as the
> existing ecosystem provides the ability to run automated tests
> on those older versions.

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* First public release of packaged module.

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* Added `ReaderLike` class to help make type-checking more convenient.
* Removed support for Python 3.1.

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* Added `from_datatest()` constructor method to read datatest `Select` and
`Query` objects.

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* Added `from_dicts()` constructor method to read iterables of
dictionary rows.
* Added `from_dbf()` to read DBF files (dBase, FoxPro, etc.).

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* Added `get_reader()` to auto-detect objects and use appropriate constructor.
* Added `from_csv()` to support Unicode-aware CSV handling in Python 2 and
Python 3.
* Added `from_pandas()` constructor method to read pandas `DataFrame` objects.
* Added `from_excel()` to read MS Excel files.