Fixes #211 and adds one test for it.
Fixes from_one_comma_delimited, no more split at space

Before from_one_comma_delimited split at ",", and " "
this made it unusable for the Accept-* headers since
their fields may contain whitespace.
Merge pull request #213 from pyfisch/issue211

Fixes #211 and adds one test for it.
Merge pull request #215 from pyfisch/fixcommadelimited

Fixes from_one_comma_delimited, no more split at space
rust upgrade
v0.0.18