Search functionality in designer is BACK!

1. Removed "knownComponents" from ceci-designer. Redundant in component-tray.
2. Fixed placeholder for component-search box.
3. display:block and "hide" class for designer-component-tray-item.
4. Search functionality, using component name, label, tags, description.
Merge pull request #1478 from secretrobotron/search

Search functionality in designer is BACK!