Feature: show histogram of captures of URI in the expanded banner when viewing a memento

[machawk1]

A la the Wayback Machine.

[machawk1]

This could be implemented as a details-on-demand query for the TimeMap endpoint for the URI-R currently being visited. That endpoint should be encoded somewhere (banner metadata?) to act as a basis for the subsequent query for the TM.

[machawk1]

Other Link header-based attributes are already exposed to Reconstructive, e.g.,

[machawk1]

URI-T exposed to reconstructive component in e859277, now just need to setup the query on expanding the reconstructive view. Follow-on steps would be to output the raw data to the DOM, clean the state into a workable data structure (e.g., JSON if the CDXJ endpoint is used, else we might think to just access the JSON-based TimeMap), then ultimately visualize this data.

• Identify an existing Wayback-style (or otherwise) histogram library that is lightweight -- d3 is a big hammer but might be useful later).