Reflection warnings

[marksto]

There are now the following reflection warnings in knit:

Reflection warning, qbits/knit.clj:126:23 - reference to field isDone can't be resolved.
Reflection warning, qbits/knit.clj:128:16 - reference to field get can't be resolved.
Reflection warning, qbits/knit.clj:129:29 - call to method get can't be resolved (target class is unknown).
Reflection warning, qbits/knit.clj:130:24 - reference to field isCancelled can't be resolved.
Reflection warning, qbits/knit.clj:131:19 - reference to field isDone can't be resolved.
Reflection warning, qbits/knit.clj:132:30 - call to method cancel can't be resolved (target class is unknown).