Remove reflection warnings

[ath]

I always specify :warn-on-reflection true in my projects, and when I (use 'criterium.core) I notice the following warnings:

Reflection warning, criterium/well.clj:71 - reference to field longValue can't be resolved.
Reflection warning, criterium/well.clj:72 - reference to field longValue can't be resolved.
Reflection warning, criterium/well.clj:75 - reference to field longValue can't be resolved.
Reflection warning, criterium/well.clj:75 - reference to field longValue can't be resolved.
Reflection warning, criterium/well.clj:76 - reference to field longValue can't be resolved.
core.clj:323 recur arg for primitive local: elapsed is not matching primitive, had: Object, needed: long

Auto-boxing loop arg: elapsed

Reflection warning, criterium/core.clj:498 - reference to field hashCode can't be resolved.
Reflection warning, criterium/core.clj:499 - reference to field hashCode can't be resolved.

[hugoduncan]

Fixed in 914250d