1.1.0 release

*  [Catalog Support](http://www.freedesktop.org/wiki/Software/systemd/catalog/).
*  `JournalEntry` no longer throws exceptions on `method_missing` since not all fields are guaranteed to be present. 
* `Journal#wait` now supports an optional argument, `select: true` which will use `IO.select` to wait instead of `sd_journal_wait`. 
* `Journal#wait_select_reliable?` indicates whether the above will wake reliably.
* moved lots of Journal code out into included modules (no external changes).