Bug 678338 - Check return values from Python API

https://bugzilla.gnome.org/show_bug.cgi?id=678338
Fix various deprecation warning from GTK+
Disable GLib diagnostics in tests
Add easy python profiling support

When the PEAS_PYTHON_PROFILE enviroment variable
is set profiling information will be output when all python
plugins are unloaded.
Use the buildir when running the demo's in running in builddir mode

Otherwise it assumes the current directory is libpeas/peas-demo
which can be a pain to figure out.
Updated Czech translation
Updated Assamese translation
Updated Galician translations
Updated Spanish translation
Updated Greek translation
Updated Hebrew translation
Updated Brazilian Portuguese translation
Updated French translation
Updated Traditional Chinese translation(Hong Kong and Taiwan)
Updated Indonesian translation
[l10n] Update Catalan translation
[l10n] Updated Catalan (Valencian) translation
Updated Korean translation
Updated Norwegian bokmål translation.
Updated Polish translation