Add the filter and delete function

Use the #newTagName input filed as a filter to trigger the filter event.
Users can have the filtered result as typing.
Modified the filter function

Set the lastModifier as another field to filter
Add validate for adding tags

Check the tag name if it is in the collection
Edit the route for APIs

put every routes for APIs into the /routes/api/ folder
Merge pull request #3 from shingo0620/master

Edit the route for APIs