Svgis

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* bump fiona requirements, now compatible with GDAL v2.
* Ignore id_field in layers without that field
* Sanitize ampersands in data fields
* Allow an x/y pair argument to `svgis project`.

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* Improve CSS parsing and creating in `style`
* Simplify string conversion in `svg`
* Expand and update tests a bit

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* Bump fionautil requirement, fixing bug that occurs when Numpy is missing.

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* Add support for zipped data
* Change "svgis style --style" shorthand option from -s to -c
* Improve support for custom map drawing workflows
* Change keyword argument for SVGIS from out_crs to crs
* Shorthand reprojections now work for with data in any projection
* build as a universal wheel
* Fix bug for unicode attributes in Python 2 (0.4.0 regression)
* Fix bug with certain uses of 'file' projection keyword
* Fix error on multipolygon coordinates in unexpanded generators

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* Make --no-viewbox default in svgis draw
* Refactor internal bounds handling, squashing a few bugs
* Better handling for precision and padding in svgis.SVGIS
* Filter out successive identical coordinates in geometries
* Fix padding to truly be in output (projected) units
* Warn, don't crash, when geometry is null
* Additional verbose flags now provide more debugging infomation
* Repair bug that sometimes added styles based on a class substring, rather than exact match
* Put r attributes right on the element when inlining
* Fix bug when layer contained a field with its name
* Restructured modules: renamed 'clip' and 'convert' to 'transform' and 'bounding'

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* Fix CDATA bug with svgis style
* refactoring, PEP 8 formatting
* Fix bug that ignored precision
* Correctly identify and use projections in projected files