Update to 0.156000

Upstream changes:
0.156000  2014-12-07 18:04:14+01:00 Europe/Amsterdam

    [ BUG FIXES ]
    * Do not try to deserialize empty content.
      (Lennart Hengstmengel, Sawyer X)
    * Do not call serialization hooks when no serialization took place.
      (Sawyer X)
    * Be more cautious on undef output from serializer.
      (Daniel B.hmer, Sawyer X)

    [ ENHANCEMENTS ]
    * Add cpanfile when scaffolding a new app.
      (D.vid Kov.cs, Sawyer X)
    * Response "content" attribute no longer stringifies. This should help
      reduce warnings, odd debugging problems, etc. (Sawyer X)
    * DSL "uri_for" no longer returns URI object. Instead just the URI.
      (Sawyer X)

    [ DOCUMENTATION ]
    * GH #777: Fix doc for mentioning public dir.
      (D.vid Kov.cs, Sawyer X)
    * GH #787: Document all environment variables. (Sawyer X)

0.155004  2014-12-04 11:51:23+01:00 Europe/Amsterdam

    [ BUG FIXES ]
    * Guard against content length being empty strings. This is really
      bizarre case but saw it once. (Sawyer X)

(wen)