Update to 0.058

Upstream changes:
0.058    2016-05-03 11:29:57-04:00 America/New_York

    - No changes from 0.057

0.057    2016-04-18 10:17:00-04:00 America/New_York (TRIAL RELEASE)

    [ADDED]

    - Added support for the SSL_CERT_FILE environment variable.

    - Added 'peer' attribute to force a connection to a particular
      server.

    - Added 'connected' method to allow introspection of persistent
      connections.

    - An array reference of redirection result hash references is included
      in the final response hash reference (but only if redirects occur).

    [CHANGED]

    - Because folded headers are obsoleted in the revised RFCs, if CRLF is
      found in header values followed by one or more spaces, they are all
      replaced by a single space.

    [FIXED]

    - Per the RFC, control headers are now sent first before other headers
      (which are sent in arbitrary order).

    - Only well-known headers have their case canonicalized; all other
      headers are sent in the case provided by the user.

    - The 'keep_alive' option now also sets the SO_KEEPALIVE option
      on the underlying socket to help with long-lived, idle connections.

    - Request header field values are now validated against the RFC rules
      (i.e. empty or else space-or-tab separated tokens of printable
      characters).

(wen)