Stop using js on search pagination

The pagination don't work with the javascript request

See #528
Live action on data-action

The errbit.js add handler on data-action but this handler not works on
action change by Ajax. with a live, it's works now

Fix #526
add new feature merge [ci-skip]
add changelog about pr merged [ci-skip]
Update changelog with Fix bug

[ ci-skip ]
Add complete documentation about flowdock notification

See #511
Update index.md
Check backtrace on migration - issue #540
Add information about create indexes in README

When you deploy a Errbit instance, it's better to have index. A rake
rake do this job.

Update of README to add this information

Fix #522
Allow create a Problem without ErrorClass

Fix #219
Release of errbit 0.2.0