Updated Serbian translation
Updated Bengali (India) translation
Updated Italian translation
Updated Latvian translation
Added Kazakh translation
Remove support for seed-based Javascript plugins

The seed bindings lack subclassing support and as such
are holding back the capabilities that libpeas can depend
on for certain features that plugins are expected to use.
The bindings are also rather unmaintained these days.

https://bugzilla.gnome.org/show_bug.cgi?id=739306
Remove everything the seed plugin loader used

This is no longer needed as the seed plugin
loader has been removed.

https://bugzilla.gnome.org/show_bug.cgi?id=739306
Rename helpers to utils
Update URLs for gnome.org changes
Cleanup PeasPluginInfo coding style and docs
No longer use a GHashTable for storing the plugin loaders

Replace with a static array and functions to convert
from a loader name to an id and back. Also, warn if an
unknown loader is given to peas_engine_enable_loader()
or specified in a .plugin file.
Implemented a Lua plugin loader using the LGI bindings
Updated Turkish translation
Make the C plugin loader thread-safe

https://bugzilla.gnome.org/show_bug.cgi?id=739619
Make the Python plugin loader thread-safe

https://bugzilla.gnome.org/show_bug.cgi?id=739619
Document that the lua5.1 plugin loader is not thread-safe

https://bugzilla.gnome.org/show_bug.cgi?id=739619
Fix setting "peas-extension-type" in the lua5.1 plugin loader

This fix was already made to the other plugins loaders.
Make PeasEngine thread-safe

https://bugzilla.gnome.org/show_bug.cgi?id=739619
Add an extension test that uses multiple threads

This should act as a good stress test for checking that
libpeas is thread-safe. This also changes testing-utils to
be thread aware.

https://bugzilla.gnome.org/show_bug.cgi?id=739619
Cleanup PeasPluginLoader checks

Check that the vfuncs are implemented once, not each
time they are called.