Use put_resp_content_type instead of dup'd private phoenix assign
Handle charset being present in response_content_type/1
Fix broken link in generated comments.
Merge pull request #245 from grempe/patch-1

Fix broken link in generated comments.
Fix broken link in generated comments.
Fix broken link in generated comments.
Merge pull request #246 from grempe/patch-1

Fix more broken links in generated comments.