Add failing test for template with number at the end

Use \w for RENDER_DEPENDENCY regex

Spacing

Add CHANGELOG entry

This reverts commit b4239622, reversing
changes made to f99ce3c1.

Reason: This broke the build
https://travis-ci.org/rails/rails/jobs/6629894

ActionView::Digestor now passes arguments correctly to
LookupContext::find method. This makes cache digests
respect the format option correctly.

FixtureFinder in tests also changed to reflect this.

A declarative API for specifying dependencies that affect template
cache digest computation. In your controller, specify any of said
dependencies:

  view_cache_dependency { "phone" if using_phone? }

When the block is evaluated, the resulting value is included in the
cache digest calculation, allowing you to generate different digests
for effectively the same template. (Mostly useful if you're mucking
with template load paths.)

test for rails/rails#8586

Add automatic template digests to all CacheHelper#cache calls (originally spiked in the cache_digests plugin) *DHH*