Using default handler for before and after request signals.

In the before_request default handler, the Response object is
initialized. This way, the Response object is still uninitialized for
connected handlers.

In the after_request default handler, the Response body is completed.
This way, anything registered after_request may still edit the body
before it gets completed.

For both, handlers can be connected after using connect_after.
Replaced printing to stderr by real error message using Glib logger.
Merge pull request #17 from arteymix/log-using-glib

Replaced printing to stderr by real error message using Glib logger.
Merge pull request #13 from arteymix/complete-response-body-in-default-handler

Using default handler for before and after request signals.
Partial integration with autotools.

I used anjuta IDE to generate basic files, so we now have an anjuta
project!
Completed integration with autotools for the library.
Added a target for the default application.

Moved all the sources and resources in src folder.

vapi files shares the src folder with other sources.

The default application has been adapted to fit the new directory
structure.