Add support for a responsible nested menu.

Related: #425

A flag that sets the default behavior to publish all pages.

For example:

# compile a simple app
$ gcc -xc - -oapp.exe <<EOF
#include<stdio.h>
int main()
{
    printf("Hello World!\n");
    return 0;
}
EOF

# build image for two providers
$ ops build app.exe -t hyper-v
Bootable image file:/home/am11/.ops/vhdx-images/app.vhdx
$ ops build app.exe -t onprem
Bootable image file:/home/am11/.ops/images/app.img

`ops instance create

We had a regression bug in tonic that was not caught by our tests.

Our tests are very unit focused.

Having examples and being able to write integration tests against example apps that consist of multiple components working together should get us decent regression tests.

This depends upon #10