Maintenance version.

Improvements

• it is possible to use Int, Boolean, String and Traversable matchers with JsonMatchers #306 and #307

• moved the setting of stacktraces on match results to the Expectations to a method. This means that now the MustMatchers object can be used outside specs2 without filling-in stacktraces (which impacts performances). On the other hand, when you mix MustMatchers trait, MatchResults will get a location (by generating a stacktrace). This behaviour can be deactivated by mixing-in the org.specs2.matcher.NoExpectationStackTrace trait

• showing more precise differences when trying to check the equality of maps

Fixes

• added details to a forall check when one of the checks has failure details
• various small fixes on collection matchers
• passing all method's arguments to mock's callback function #308 by @dratewka

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