This adds an additional (boolean) parameter to both endTransmission() and requestFrom(), which specifies whether or not to send a stop condition after the corresponding transmission. This defaults to true, as in the previous behavior of the library.
http://code.google.com/p/arduino/issues/detail?id=663
write(), print(), println() now return size_t (and don't use negative values to signal errors).
Print adds writeError() for checking for write errors, clearWriteError() to reset the flag to false, and a protected setWriteError() for signalling errors.
http://code.google.com/p/arduino/issues/detail?id=598