* added method to purge (clean, empty, free, whatever) the current contents of the plist collection * fixed getValue() which crashed when del(0) was called before
* added method to purge (clean, empty, free, whatever) the current contents of the plist collection
* fixed getValue() which crashed when del(0) was called before

Tonyliu2ca/CFPropertyList,rodneyrehm/CFPropertyList,Tonyliu2ca/CFPropertyList,rodneyrehm/CFPropertyList