Add changelog for 0.17.0.
Bump version to 0.17.0.

Changes:

* Update fpm dependency to 1.0.0. (joschi / #62)
* Add `-q` command line option to disable progress bars. (#58)
* Add `directories` recipe attribute. (#53)
* Add `autogen` build helper. (sepulworld/autogen-support / #54)
* Add `root_prefix` and `root` path helper. (sepulworld/set-root-prefix / #52)
* Support recursive omnibus recipes dependencies. (avishai-ish-shalom / #49)