Remove #backtrace_clean_patterns.

This was deprecated a while ago. We've got deprecation specs in 2.99.
This patch removes it. This also renames the cukes.

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
we need to be able to overide call_site for it to be useful
Merge pull request #925 from JonRowe/let_user_override_call_site

Let callers of deprecate override call_site with specific values
Make the .feature for backtrace_exclusion_patterns read better.

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Cleanup use of some built in enumerable functions

* Replace += with + in the inject in example_group_count
* Use each_value instead of each to remove an unneeded block variable in
  dump_profile_slowest_example_groups
Add a changelog entry for #927.

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Merge pull request #923 from samphippen/remove-backtrace-clean-patterns

Remove #backtrace_clean_patterns.
setup coveralls
badge readme
tweak setup