Filtering format

[John-Bosch]

Consider using a symbol format more like, or consistent, with OData by using terms such as eq, le, lt, ge, gt, etc. for complex filtering.

By doing so the escape requiring '>' and '<' can be avoided, as can the query parameter key/value separating '='. This would make general parsing of the query string considerably easier and, if consistent with OData, would bring in to play the plethora of existing filter string parsing libraries.

[TimGoodwill]

PR #53