typo in EEPROM.h

Hi,

I have this warning in EEPROM.h in both stable and nightly release, while setting compiler warnings to 'All', on linux and macosx:

In file included from inl.ino:1:0:
.../Java/hardware/arduino/avr/libraries/EEPROM/EEPROM.h:43:30: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
     operator const uint8_t() const       { return **this; }
                              ^
.../Java/hardware/arduino/avr/libraries/EEPROM/EEPROM.h:92:26: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
     operator const int() const          { return index; }
                          ^

It turns out that the first 'const' on both lines is useless and should be removed.

Thanks for reporting, I turned it into an official report.