* gstreamer-sharp/glue/Bin.c: Newly added. Added a function to
return the offset of *children.
* tests/ElementTest.cs: Newly added. Added two NUnit tests for
Element class - one to test creation of elements and the other
to test addition and deletion of Pads from elements.
git-svn-id: svn://anonsvn.mono-project.com/source/branches/abock/gstreamer-sharp@61443 e3ebcda4-bce8-0310-ba0a-eca2169e7518