Rio-tiler

* surface `allowed_exceptions` options in `rio_tiler.mosaic.reader.mosaic_reader` (https://github.com/cogeotiff/rio-tiler/issues/293)
* add SpatialInfoMixin base class to reduce code duplication (co-author with geospatial-jeff, https://github.com/cogeotiff/rio-tiler/pull/295)
* add `AsyncBaseReader` to support async readers (author geospatial-jeff, https://github.com/cogeotiff/rio-tiler/pull/265)

* surface dataset.nodata in COGReader.nodata property (https://github.com/cogeotiff/rio-tiler/pull/292)
* fix non-threaded tasks scheduler/filter (https://github.com/cogeotiff/rio-tiler/pull/291)

* switch to morecantile for TMS definition (ref: https://github.com/cogeotiff/rio-tiler/issues/283)
* add tms options in Readers (breaking change if you create custom Reader from BaseReader)
* add tile_bounds vs bounds check in tile methods for MultiBands and MultiBase classes
* add tile_exists method in BaseReader (take tms in account)
* adapt zooms calculation in COGReader
* add `LastBandHigh` and `LastBandLow` pixel selection (ref: https://github.com/cogeotiff/rio-tiler/pull/270)

Deprecated function

- rio_tiler.reader.tile
- rio_tiler.utils.geotiff_options
- rio_tiler.utils.tile_exists
- rio_tiler.io.multi_*

* remove `pkg_resources` (https://github.com/pypa/setuptools/issues/510)
* refactor default colormap lookup to use pathlib instead of pkg_resources.

Note: We changed the versioning scheme to `{major}.{minor}.{path}{pre}{prenum}`

* Fix missing Exception catching when running task outside threads (ref: https://github.com/developmentseed/titiler/issues/130).
* add rio-tiler logger (https://github.com/cogeotiff/rio-tiler/issues/277).

* Fix bug in `MultiBandReader` (ref: https://github.com/cogeotiff/rio-tiler/issues/275) and add tests.