webfaf2: add component and crash fn to title

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
add report.crash_function, introduce utils/storage

- reprot.crash_function and problem.crash_function share the same code
- moved format_reason to utils/storage

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
webui2: remove nonexistent problem.js

Signed-off-by: Richard Marko <rmarko@fedoraproject.org>
Merge pull request #312 from abrt/better_title

webfaf2: add component and crash fn to title