Make the opencpu library capable of turning off logging and alerts.
If the opencpu connection fails, then don't try to use it.

If the ocpu.seturl call fails, don't try to use it any more.
Also turn off opencpu logging and alerts.
Add NeonAngularDemo package for R.

A package is needed because OpenCPU expects all functions used by an
application to be in one package, and that package should include any
dependencies that it needs. Also, OpenCPU makes it much easier to do a single
function call than to execute a whole script.