Patch of category/null

Patched bug introduced in previous release.

Performance improvements

Switched to collection load, instead of repository. Removed cache tags from menu items. They are redundant, as are not really the separate entities to be requested from frontend.

Shorter cache tags - x4 times more items can be cached

Fix for large menus - too many of items caused the nginx to fail response with header too large.

Added event after collection load

Implemented an event dispatch for later implementation of cache identities.

Fixed multi-store behaviour

Previously it was impossible to use multiple menus in different stores.

Improved error messages

Merge pull request #6 from mihailspopovs4/menu-organizer-better-errors

Improvements for Menu resolver

Patch: fixed wrong dependencies

In this patch wrong dependencies were removed.

Release: loading by identifier, not ID

In this release loading Menu by ID has been removed, it is now loading by identifier.

Patch: Fixed wrong dependancies

Merge pull request #3 from ainarssondors/master

 Fix variable paths