Make use of the new error handling in Go to return more interesting failures.

hi,

Can you create more sample codes for:

• Node creation
• Interface discovery
• Adding pollers, etc

To make working with the results from a SWQL query easier add these convenience methods.

Since the pattern of querying and then unmarshalling into a struct is common, combine them (optionally?) so it's call like this:

nodes, err := client.Query(query, nil)

Add method to provide multiple URIs at the same time when providing updates to the entities.

Deleting containers requires a single float64 value, but the JSON must submit a single-element array to be effective.

Non-text custom property assignments aren't handled correctly. Currently strings are the only ones working.

When the API times out, handle the error and apply throttling.