Lizard-map

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- Add global to js file to satisfy jslint.

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Attention: You need to add 'django.core.context_processors.request' to
your TEMPLATE_CONTEXT_PROCESSORS in order to make map-locations work
correctly. For more information see the README.

- Moved some functions to mapnik_helper.

- Add tests for Color, bugfix Color.

- Add South for database migrations.

- Add option for Google Maps background layer.

- Model LegendPoint now has parent Legend.

- Add default_color to Legend and LegendPoint models.

- Bugfix float_to_string.

- Moved adapter layers.py to lizard-shape.

- Removed extent coordinates from model Workspace.

- Add actions map-location-save and map-location-load.

- Bugfix when name is None.

- Bugfix int in id_field would result in an error.

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- Remove necessity of google_coords in popup_json and popup_collage_json.

- Show snippet name when adding shapefile layer to collage.

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- Pinned newest lizard-ui version.

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- Moved js setUpLegendTooltips() to lizard_ui: setUpTooltips().

- Refactor Colors: removed model, add ColorField.

- Reimplemented search function using shapely. Before it was
implemented using Mapnik and it worked only with polygons.

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- Make adapter_shapefile more generic, removed default settings.

- Added mapnik_helper.py for mapnik helper functions.

- Added mapnik_linestyle to Legend object.