Allow vendor-specific args in WMTS tile requests.
Add support for TileMatrixSetLimits.
Update test scripts.
Cope with inconsistent WMTS spec.
Re-instate `tilematrixsets` as deprecated.
Merge pull request #158 from rhattersley/wmts-kwargs

Allow vendor-specific args in WMTS tile requests.
Merge pull request #155 from rhattersley/limits

Add support for TileMatrixSetLimits.
Merge branch 'wmts-docs' of https://github.com/rhattersley/OWSLib into mergeme

Conflicts:
	owslib/wmts.py
Merge branch 'wmts-docs'