Make it possible to open hyperlinks from MS office

links need to point to new sessions path with redirect_to param, which
must point to target path, where to redirect

The problem is that MS office tries to download target page, but it's
not authorized, so it's redirected to login page. Then MS office opens
browser, but instead of passing original URL it passes redirect URL, so
even if you're logged in, you can't open link from office poiting to
correct resource.
Supposedly fix failing tests on ci server
Merge pull request #141 from cubesystems/ms_office_links_workaround

Make it possible to open hyperlinks from MS office
Toolbox: DRY opening functionality
Toolbox: refactor opening to event based functionality
Ability to pass additional data to validation errors
Merge pull request #142 from cubesystems/errors_with_additional_data

Ability to pass additional data to validation errors
Update Releaf::ErrorFormatter to support error data
Update validator.js to support error object data attribute
Merge pull request #143 from cubesystems/errors_with_additional_data

Ability to pass additional data to validation errors, part 2