Add toJSON Handlebars view helper
Simplify readers & scans to reflect distinct rfid-reader doctype
Display tap ID in tap/rename
ID and ReaderID fields on taps
Conserve connections, use global_changes
Revert "Conserve connections, use global_changes"

This reverts commit 8192778cd832f3f09a3f4789fc8f14d7a04a3942.