Make "No Ping" connection pool default
Refactor CurlMultiConnection's handling of curl options
Refactor handling of custom options in GuzzleConnection
Reconcile configuration options and runtime options

This merges configuration curl options with options that are set
at runtime, such as ping-specific timeouts
Increase timeout for YAML integration tests

Sometimes the yaml tests fail due to load on the test box.  Increase
the timeout so that timeout-related failures are less common.