Unsubscribe from app. ref 14873
Minor fix
Spec comment fix
Merge branch 'errbit' into feature/upstream_merge
Merge upstream
Remove return(false) from before_filter "require_watcher_edit_priviledges"
Merge branch 'errbit' into feature/upstream_merge
report the actual url as request_url

Reporting the hash turns (for me) out to be error prone as I do not get the actual host.
move the validations for error_class and environment from Err to Problem

Problems are the models rendered in the UI now, not Errs. Errs are functioning as a glorified hash table. It makes more sense to validate problems.

Also, this paves the way for the next commit, so that no functionality is lost in the subsequent refactor.
Errs are like a hash table whose values are arrays of notices and whose keys are a composite of error_class + component + action + environment + backtrace[0..3].

These fields no longer need to be cached separately on Err because they are now cached on Problem.

This commit combines all those values into one simple key: fingerprint. This should:

 - Make err lookups faster
 - Make it easier to reason about, test, and replace the fingerprint algorithm
 - Make the relationship between Problems, Errs, and Notices clearer
[WIP] Start refactoring the problems_controller.

1) Limit some before_filter using the expose system
2) Extract some view test in view spec instead of controller spec
[WIP] refactor the problems_controller

Extract the filter `find_problem` in decent_exposure to get this problem
Added jira as new issue tracker
Add documentation about all Env variable usage

Errbit can be config anly by ENV variable. We need a complete
documentation about it and improve this variable capabilities with not
only Heroku point of view
Improve information about ENV configuration
Fix spec because now the spec use TimeZone too in Mongoid
Add link to the ENV documentation from the README
Merge pull request #507 from shingara/features/improve_documentation_about_variable

[WIP] Features/improve documentation about env variable
Fix spelling in README [ci skip]
Merge pull request #520 from crymer11/patch-1

Fix spelling in README [ci skip]