Adding in support for Cache Flush Open API v2.3.2

I received word from CDNetworks that the Cache Flush Open API v2.3.2 is the most current API, rather than Cache Purge Open API v2.0,

This pull request leaves support for the 2.0 api methods in, but adds in methods associated with 2.3.2.  2.3.2 has some more advanced flushing parameters (i.e. specifying what type, "item", "wildcard", or "all".