Mercantile

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- New feature: the ``feature`` function returns a GeoJSON feature for a tile
(46).

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- New feature: the ``lnglat`` function is the inverse of ``xy`` (62).
- New feature: the --bounding-tile option of mercantile-tiles has been made
into a new mercantile-bounding-tile command (43).
- API change: the --bounding-tile and --with-bounds options of
mercantile-tiles have been removed.

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- API change: ``InvalidLatitudeError`` is raised by ``tile`` when Y cannot be
computed.
- New feature: ``xy_bounds`` to get Spherical Mercator bounds for tile (60).
- New feature: ``Bbox`` class with ``left``, ``bottom``, ``top``, ``right``
properties (60).
- Bug fix: prevent ``tiles`` from returning tiles with invalid indexes (47).

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- Refactoring: new ``normalize_input`` and ``iter_lines`` functions for
use in the CLI (58).
- Refactoring: the coarse ``try/except`` blocks have been removed from within
CLI subcommands, ``sys.exit`` calls are removed, and ``sys.stdout.write``
calls have been replaced by ``click.echo`` (58).
- Refactoring: many PEP 8 changes and new tests to bring the project to 100%
coverage (58).
- New feature: functions and subcommand for converting between tiles and
quadkeys (50, 51, 56, 57).
- Bug fix: correct output when a point is given to mercantile-tiles (48, 49).
- Bug fix: more consistent interface for tile arguments (53).

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- Fix error in lng/lat truncation. If lat was > 90, the *lng* was set to a
wrong value.

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- Add tiles() function (38).
- Split antimeridian crossing bounds in tiles() (40).