Moved general gstreamer helper classes into separate library.

Cleaned up configuration of gstreamer with a separate config
test.

Change-Id: I1ec9ee466233687fbcfdc544a12d9fce578e4379
Reviewed-on: http://codereview.qt-project.org/6459
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

config.tests/gstreamer/gstreamer.pro

@@ -0,0 +1,20 @@
+TEMPLATE = app
+DEPENDPATH += .
+INCLUDEPATH += .
+
+requires(unix)
+
+# Input
+SOURCES += main.cpp
+
+CONFIG += link_pkgconfig
+
+PKGCONFIG += \
+    gstreamer-0.10 \
+    gstreamer-base-0.10 \
+    gstreamer-interfaces-0.10 \
+    gstreamer-audio-0.10 \
+    gstreamer-video-0.10 \
+    gstreamer-pbutils-0.10
+
+