created Examples feature

Change-Id: Ib5d0f309e77b4393241a043ed2d72b871dbe8125
examples are not in p2 repository

but they are bound to the workspace

Change-Id: I60f1e1dd10d7b53d1592513b3e89fcfaba50d284
wizard for importing examples

Change-Id: I8cc5f87671947c31633286cae205f31f653449d2
swtbot test for example import

Change-Id: I52f4f1e0afc3b5692368f17dd5ad2ca94153868d