Nik4

* Choose any projection with `--projection`. [29](https://github.com/Zverik/Nik4/pull/29) - thanks Nakaner.
* Removing `status="off"` for enabled layers. [27](https://github.com/Zverik/Nik4/issues/27), [#28](https://github.com/Zverik/Nik4/issues/28)
* Refactoring and PEP8 compliance.
* Fixed mapnik bindings that require 8-bit strings. [30](https://github.com/Zverik/Nik4/pull/30) - thanks Nakaner.
* Fixed scale calculation with `--fit` option present. [33](https://github.com/Zverik/Nik4/pull/33) - thanks knowname.
* You can use `--tiles NxM` (e.g. 2x4) now. [35](https://github.com/Zverik/Nik4/pull/35) - thanks woodpeck.

* `--version` option.
* Added `--fonts` option for registering additional fonts. [16](https://github.com/Zverik/Nik4/issues/16)
* Fixed `--center` with `--scale` error. [18](https://github.com/Zverik/Nik4/issues/18)
* Swapped sizes 4A0 and 2A0. [17](https://github.com/Zverik/Nik4/issues/17)
* Support Python 3. [23](https://github.com/Zverik/Nik4/issues/23)

* Removed debug output for `--url`.
* Substitute variables with default values when `--vars` is empty.
* `--just-tiles` option for keeping tiles instead of merging them, also creates ozi/wld files if needed. [15](https://github.com/Zverik/Nik4/issues/15)

* **Breaking change:** width and height specified in `--size` and `--size-px` are now swapped if they fit bbox better that way. Use `--norotate` to preserve old behaviour (that is, to force `WIDTH HEIGHT` order).
* You can specify 0 for one of the dimensions: first one is considered "long" side, the second is "short". E.g. for "portrait" bbox size "0 123" could become "123 200". `--norotate` option also applies to this. [10](https://github.com/Zverik/Nik4/issues/10)
* Added `--dpi`, a synonim for `--ppi`.
* Now allowing underscores in variable names.
* Streaming output to `-` (stdout) now works. [9](https://github.com/Zverik/Nik4/issues/9)

* Fixed value order in world files.
* Added more paper formats. [7](https://github.com/Zverik/Nik4/issues/7)
* Style XML can now be streamed from stdin.
* Style XML can now contain variables `${name:default}`, set them with `--vars name=value`. [6](https://github.com/Zverik/Nik4/issues/6)

* Fixed georeferencing of tiled maps. [4](https://github.com/Zverik/Nik4/issues/4)
* World files are now written in EPSG:3857 projection.
* Added `--url` option for leaflet / openlayers map URLs. [5](https://github.com/Zverik/Nik4/issues/5)