Add $compute to supported $select query options

4.01 adds support for $select options such as nested $select and $expand and, for collection-valued properties, $top, $skip, $orderby, and $count.

As pre ABNF and URL Conventions, we also allow $compute as a $select option, that is missing from the section on $select in the Protocol document, which states:

"...Allowed system query options are $select and $expand, plus [$filter|http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptionfilter], [$search|http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptionsearch], [$count|http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptioncount], [$orderby|http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptionorderby], [$skip|http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptionskip], and [$top|http://docs.oasis-open.org/odata/odata/v4.01/cs01/part1-protocol/odata-v4.01-cs01-part1-protocol.html#sec_SystemQueryOptiontop] for collection-valued properties."**++