Brought return values of erlang_fast_segment:encode/3 and
erlang_fast_segment:decode/2 in line with comments in
src/erlang_fast.erl. Previous changes in src/erlang_fast.erl were not carried over to src/erlang_fast_field_encode.erl
uncommented and updated tests in src/erlang_fast_test.erl
Merge pull request #2 from AlexandreBeaulne/return_values

Carried over previous changes in src/erlang_fast_segment.erl to src/erlang_fast_field_encode.erl