Merge pull request #4 from cablelabs/ruih/master

Pull updates from ruih/master. We need these updates for trick modes to work property for CVP2 plugfest36 effort.
Fix for gst-plugins-base gstsubparse gsttags library dependancy
Undo mistaken changes to gst/subparse/Makefile.am.
Merge pull request #5 from cablelabs/cbl_cpratt/fix_for_gstsubparse_link_error

Fix for gst-plugins-base gstsubparse gsttags library dependency