refactored has_manys, added some tests for plugins
fixed bug with dirtying hasMany on deleting new objects
fixed possible bug in hasMany
reverted previous commit
fix for originalContent of new objects
cleaning of hasManys after save
test fixes
added reload prop
hasMany.isLoaded on save. model.reloadProp for

set isLoaded on collections after save
added reloadProp for rest attrs
merge