chore: Bump version to 0.1.6post2 and update CHANGES accordingly
fix: Incorrect build tag
fix: Content-Length header always 0 for resp.data

Currently, the Content-Length header is always set to zero when
resp.data was used in lieu of resp.body. This patch fixes
the content_length helper so that it now checks for resp.data,
in addition to resp.body and resp.stream.
chore: Bump version to 0.1.7.dev1
fix: Encode body and update resp.body

The patch sets the encoded body to resp.body so that other functions /
calls using it can operate on the updated value, which is the one that
will be sent back to the client.

fixes #158
fix: keep body and make encoding process explicit
Added some docstrings and tests
fix: Added missing tests and rebased fixes #158