Copied methods from transient method dict to persistent method dict in the call of maglev_persistable to persist methods as well.
Added tests for maglev_persistable having an optional flag which indicates, whether methods are persisted or not.
Improved test to check for methods after call to maglev_persistable(true).
Added flag for maglev_persistable.
Merge pull request #283 from MagLev/stefan/maglev_persistable_persists_methods

Adde flag for maglev_persistable which allows to persist methods