2.19.2 (unstable):

* File: Added make_directory_with_parents() method overload with no parameter.
  Bug #566003 (Philip Belemezov).
* NoteTree: Do not use a non-ASCII dash character in a comment, to 
  avoid the MSVC++ warning C4819 with Visual Studio 2008.
  (Tao Wang) Bug #568072
* spawn_*() functions: Added alternative API for when 
  GLIBMM_EXCEPTIONS_ENABLED is not enabled. (Murray Cumming)
  Bug #565487 (Jonathon Jongsma)
* uri_*() functions: Fix memory leak.
  (Jonathan Jongsma) Bug #566845 (Jason Kasper)
* ustring: Add an overload which takes only a format string and no arguments 
  to be substituted. (Daniel Elstner) Bug #506394.