Updated d/changelog version to 0.1.8+sipe-1
Build-Depend on libgstreamer1.4-dev
Add /opt/gstreamer1.4 to PKG_CONFIG_PATH and DEB_SHLIBDEPS_INCLUDE
Install GStreamer plugin into /opt/gstreamer1.4
Rename gstreamer1.0-nice -> gstreamer1.4-nice
Depend gstreamer1.4-nice on an exact version of libnice10