#160. ChainedDynamicProperty.BooleanProperty requires DynamicBooleanPropertyThatSupportsNull. But there's no public constructor for that class. Open the constructor to be "public".
#160, #162. ChainedDynamicProperty.BooleanProperty requires DynamicBooleanPropertyThatSupportsNull. But there's no public constructor for that class. Open the constructor to be "public".

Add LongProperty
Merge pull request #161 from howardyuan/master

#160. ChainedDynamicProperty.BooleanProperty requires DynamicBooleanProp...