Port custom tools, streams and links from EarthSim

[philippjfr]

No description provided.

[jbednar]

Presumably these will need some user guide notebooks? I also don't see what makes them geoviews specific (as opposed to HoloViews) on a quick glance.

[philippjfr]

I also don't see what makes them geoviews specific (as opposed to HoloViews) on a quick glance.

I realize this discussion happened a while ago but we discussed the plan that these would move to GeoViews for the time being on multiple occasions and eventually could migrate up to HoloViews under two conditions:

a) We decide to generalize the annotators further
b) We decide we actually want to ship bokeh extensions as part of HoloViews itself

[jbednar]

@philippjfr and I have been discussing this, and I believe the plan is (which Philipp can correct if needed):

• For now, move the tools here into GeoViews so that they become available for use immediately
• All tools except for PolyVertexEditTool are useful for any Bokeh drawing-tools user, and we will try to get those into Bokeh itself.
• PolyVertexEditTool would stay here in GeoViews indefinitely, as it's a specialized geo-specific tool
• HoloViews won't need any new tools and thus will continue not to need any Bokeh extensions.
• The main documentation and examples will be in HoloViews, with some geo-specific examples here.

[philippjfr]

@kcpevey You might also want to test this PR which adds geo-support for the annotators along with some of the other custom tools.

[coveralls]

Coverage decreased (-1.9%) to 43.548% when pulling c915ce2 on philippjfr/custom_tools into ef14244 on master.

[philippjfr]

I'll merge for now so I can test releasing the custom bokeh models.