Using POST to read data

[bantolov]

Using URL query string for filter parameters may lead to problems with URL length limit.

The web API should contain POST method on (module)/(entity)/Read. I think it would be cleaner if the request body (filter and paging parameters) does not use the current query string format. Instead, the client should simply serialize ReadCommandInfo structure.

Prerequisite for simply using ReadCommandInfo as the method's argument in WCF is implementing JSON.NET (issue #2), because of object member deserialization in FilterCriteria class.