ruby-protocol-buffers points to centzy fork
add get_expected_field, get_optional_field
commit
rename get_expected_field to get, rename get_optional_field to get\!
switch get and get\!, have get take an optional block that is called if the field is not set and the block's value returned
Merge pull request #27 from centzy/master

get_expected_field, get_optional_field