fix authentication and refund on delete vm
refactor app daemon register to get delete app req
db function for delete app
sample environment variable
extensive tests for delete app and vm
refactor test utilities
minimum locking balance on deployment
locking balance on app deployment
refunding locked nano while error on daemon
returning appropreate error on app deployment
fixed some typos on logging
new timeout constants for daemon respose
minor change in schema and proto
extensive tests on app deployments
fixed some vm tests
