add second set of gstreamer mediacore sources to update, use makefile to determine which to build
update include makefile paths and licenses
gst_pad_get_negotiated_caps -> gst_pad_get_current_caps
"message->structure" -> gst_message_get_structure
update plugin lookup paths
"plugin->desc" and "plugin->filename" -> gst_plugin_get_*
"factory->details" -> gst_element_factory_get_metadata
gst_object_sink -> gst_object_ref_sink
tweak option in configure.ac

Conflicts:
	configure.ac
there isn't an interfaces library for gstreamer 1.0
use GstVideoOverlay instead of GstXOverlay
Keep the gst_object_ref when using gst_object_ref_sink
gst_tag_list_new() -> gst_tag_list_new_empty()
GST_PAD_CAPS -> gst_pad_get_current_caps
GstSample instead of GstBuffer for gst_tag_image_data_to_image_*
gst_pad_add_event_probe -> gst_pad_add_probe
Use GstMapInfo and gst_buffer_map to get gst_buffer data and size
GST_BUFFER_SIZE -> gst_buffer_get_size
D'oh!
Update makefile include paths