Fix class name of assigned to lightbox.
Merge pull request #13 from taigaio/regression-assigned-to-lightbox-fix

Fix class name of assigned to lightbox.
Update README.md
IMproved visual drag&drop and normalkized styles in kanban and taskboard
Attachment list responsivized
Reduced code font size to small predefined size. Fixes #858
Added hover on avatar cards. Fixes #733
Add resolver client cache
fix #678
Fixed bug on unexisting wiki pages
disable custom scroll
fix user keyboard navigation
Add tags autocompletion directive
Move tags directive from taigaBase to taigaTags
update gulp-jade-inheritance
Check scss lint
Add tgHistory directive.

This is a complete rewrite of the old tgChange directive
that has a lot of functions that works only with dom mutability
and with unclear name. This new version works in majority of
time with immutable operations and only mutates the dom in
the last render step.
Remove old tgChange directive code.
Unify styles between comments and activity.
Remove now unused history loading code and event handlers.

From issue, task and userstory details modules.