hooked in the edit tree info button for new tree & exiting tree views.
Submit button does not work yet (returns a 406 unacceptable error)
Added the key name to the validation error message.

NOTE: validation method will produce a 500 error when entering a string
for a number, the validation function needs updating.
Tree info (species, angle and distance) section is editable and will
save for existing trees only!  Still need to set treeid and subtreeid
for new trees.  Added validate function and invalid event listener to
the Tree model... no code just yet.