Merge pull request #31 from ddavidov/develop

Updates
Grunt tasks updated
Vendor zlux updated
Deprecated language packs removed
ZL Menu Item field improved making unnecessary to "save twice" anymore
Don't resize if no params set
Avoid processing 0 bytes files
Events name updated
Bumped changelog/version
Merge branch 'release/3.1.18' into develop
Reverted ZLUX 1 Item filtering function to its version before zlux 2, fixing reported issues
Bumped changelog/version
Merge branch 'release/3.1.19' into develop
Escape the JS breaking characters in qTip layout. #28 solved
ItemModel: if no filter data avoid unnesessary iterating
Environment Helper ZL extension view compatibility
Workaround for new Plugins order
Minor fix
ZLUX updated