Updated changes.h according to last pull requests.
Merge pull request #112 from gassmoeller/update_changes

Updated changes.h according to last pull requests.
update release task list
initialize needs to be a virtual function
Merge pull request #113 from tjhei/fix_initialize_call

initialize needs to be a virtual function
initialize() cleanup

Now all plugin interfaces have an initialize() function that will be
called *after* SimulatorAccess is available.
leave a todo
call initialize for termination criteria
use the official initialize()
only initialize adiabatic_conditions once
adiabatic InitialProfile will only run once now
improve documentation
Merge pull request #115 from tjhei/cleanup_initialize

Cleanup initialize
clean up a TODO comment