Improve module's abstract

Ref: http://blogs.perl.org/users/neilb/2014/07/give-your-modules-a-good-abstract.html
Placate Perl::Critic
Configure tidyall

Also, remove the Perl::Critic test from dist.ini because I want to check
perlcritic on the pristine code and not on the code mangled by dzil.
Add deprecation warning and reference to JIRA::REST
v0.42

  [Changes]

  - Add deprecation warning and reference to JIRA::REST.