0.0.4

• API CHANGE: Uwt_error removed. Functions that possibly fail with no-unix error codes will now always return ('a, Uwt.error) result Lwt.t, all other functions will Lwt.fail with Unix_error. Unix.ECANCELED is unfortunately missing, you have to use Uwt.of_unix_error x = Uwt.ECANCELED instead.
• uwt now compiles with Microsoft Visual Studio (14.0 only)
• internal libuv version updated to 1.10.0
• updated lwt.unix compatibility layer