remove low-level read_* methods for OO API, and refactor Node
remove low-level read_* methods for OO API, and refactor Node

-calls to read_* can be replaced with calls to Node.read()
-add Node.find, and make Node description etc properties

some of this may need some further discussion :P

stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda,stcorp/coda