Append and setBytes with offset and len on Buffer

Fixes #54

Signed-off-by: Danny Kirchmeier <danny@kirchmeier.us>
Merge branch 'master' into bufferOffsets
Tested Buffer

Signed-off-by: Danny Kirchmeier <danny@kirchmeier.us>
Merge pull request #56 from danthegoodman/bufferOffsets

Append and setBytes with offset and len on Buffer