Bump mapproxy from 1.9.0 to 1.10.4

[dependabot]

Bumps mapproxy from 1.9.0 to 1.10.4.

Changelog

Sourced from mapproxy's changelog.

1.10.4 2017-08-17

Fixes:

Fix Cross Site Scripting (XSS) issue in demo service (#322).
A targeted attack could be used for information disclosure. For
example: Session cookies of a third party application running on
the same domain.

1.10.3 2017-07-07

Fixes:

• Fix crash during clipping
• Fix bilinear/bicubic resampling from cropped source
• Fix loading empty coverages

1.10.2 2017-06-21

Fixes:

Fix coverage clipping for caches with a single source

1.10.1 2017-06-06

Fixes:

• Fix mapproxy-util serve-develop for Python 3.6 on Windows
• Fix OGR coverages on Windows with Python 3 and official OGR Python bindings
• Fix --repeat option of mapproxy-util scales

1.10.0 2017-05-18

Improvements:

Support for S3 cache.
Support for the ArcGIS Compact Cache format version 1.
Support for GeoPackage files.
Support for Redis cache.
Support meta_tiles for tiles sources with bulk_meta_tiles option.
mbtiles/sqlite cache: Store multiple tiles in one transaction.
mbtiles/sqlite cache: Make timeout and WAL configurable.
ArcGIS REST source: Improve handling for ImageServer endpoints.
ArcGIS REST source: Support FeatureInfo requests.
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Commits

• a24cb41 prepare for 1.10.4 release
• 87faa66 demo: escape args to avoid XSS
• e4694fd prepare for 1.10.3
• c0e7b91 fix loading empty coverages (closes #316)
• ebae65c fix bilinear/bicubic resampling from cropped source
• 9205e51 clip coverages: fix crash when buffered mask polygons are empty
• 4779c47 update version and CHANGES for 1.10.2 release
• e98d770 fix coverage clipping for caches with single source
• 4547a22 bump version for next release
• 30b3ef8 update CHANGES and version for 1.10.1 release
• Additional commits viewable in compare view

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