Change the height controller to use the hieght rest
Change the height controller to use the hieght rest

Instead of using the chain REST call which queries
the blockchain just use the height endpoint which
uses the height value stored in memory.  It still
gets updated on every change by the
monitor_blockheight callback.

ericmvaughn/blocks,blocledger/blocks,blocledger/blocks,ericmvaughn/blocks