Define Web Agents in server.recon file

Add a new cookbook with the following features:

[x] Illustrate how to define web agents using the server.recon file. The other examples in the cookbook use the annotation based web agent definition. Use the code from the Web Agent cookbook and replace the annotations with the server.recon file.
[x] Add properties for the web agents in the server.recon file. Add code in the Web Agents to read the properties, will be good to show how properties of different types can be loaded i.e String, int, float, boolean. Might be good to show loading Value type properties as well

swimos / cookbook