Identify partials not in use

[benjaminwood]

Related to removing prototype - @scytacki suggested that identifying partials that are not being rendered would be helpful. Without coverband in production this will be best-effort as some partial names may be constructed dynamically.

[benjaminwood]

Spoke with @tjchambers and we agree that the only reasonable way to approach this is dynamically. Searching statically will not render results that we can depend on.

Given that test coverage is not comprehensive and also that views are not rendered in the test suite, I suggest that we wait until we can use coverband in production to identify which partials are not in use. It'll be real easy at that point :-)