Rasterio

-------------------
- Redesign CLI as dynamically loaded entry points (346).

-------------------
- Return masked arrays in the boundless read case (338).
- Add -o/--output option to rio-calc,merge,stack,mask,shapes,rasterize (333).

-------------------
- New rio-mask command (323).
- Masking bug fix for rio-shapes (335).
- Addition of single valued nodata property to be used instead of nodatavals
(329).

-------------------
- Switch read() default to masked=False (300, 317).
- Fix documentation of masking throughout module (305).
- Remove option for in place nodata filling (309).
- Enhancements for valid data footprint extraction in rio-shapes (316, 318).

-------------------
- Add missing blockxsize, blockysize, tiled keywords (301).

-------------------
- New rio-calc command (175).
- Added a file band shortcut to fillnodata() (271).
- Added fillnodata() to rio-calc functions (277).
- New approach to masking arrays on read that conforms more closely to GDAL's
RFC 15 (282, 284, 285).
- New read_masks() method (284).
- Deprecation of read_mask() and read_band (284).
- New affine transform factory functions from_origin(), from_bounds() (287).
- Improve correctness of indexing and rio-merge logic (288, 290).