new BeAfter matcher for time.Time values
new HaveKeyValue matcher to match a map key and it's value
rename new HaveKeyValue matcher to HaveKeyWithValue
rework new BeAfter matcher to BeTemporally
revert changes to the formatting of time.Time
Change args for BeTemporally from interface{} to time.Time
Merge pull request #41 from rightscale/master

new BeAfter matcher for time.Time values