gstreamer-gi: add sample queue.rb
gst-gi: fix Gst::Element#pause
Merge pull request #131 from ted-n/gi-samples-queue

gstreamer-gi: add sample queue.rb

Patch by ted-n. Thanks!!!
gstreamer-gi: add missing parenthesis
gi: export rbgutil_start_callback_dispatch_thread() from Loader
gstreamer-gi: start callback dispatch thread

Reported by NAKAJIMA Takashi. Thanks!!!
gstreamer-gi: add sample typefind
Merge pull request #132 from ted-n/gstreamer-gi-samples

gstreamer-gi: add sample typefind

Patch by ted-n. Thanks!!!
gi: map to_string to to_s

Because to_s is Rubyish method name.
gstreamer-gi: follow to_string -> to_s change in gi
gstreamer-gi: add "the original" notation
gi: remove a needless "s"
gi: add arguments validation
gst-gi: fix a bug in arguments validation of function
gi: support variable arguments validation
gi: show unsupported callback type name
gstreamer-gi: support GstTagForeachFunc callback
gi: map foreach to each
gi: return array content if returned array has only one element
gi: support Enumerator for without block call