Made it possible to build WS parameters using `List` (see ceylon/ceylon-herd#102)
Now passing member query parameters if the target Herd API version is 4 or higher (see ceylon/ceylon-herd#102)
Added bunch of missing test cases for Herd (also depends on ceylon/ceylon-herd#191)
Added tests for member searches (see ceylon/ceylon-herd#102)