Hack file for elasticity example
Merge remote-tracking branch 'upstream/elasticity' into elasticity

Conflicts:
	notebooks/elasticity_test.ipynb
Fix Sfepy api issue

Address issue #49

Sfepy recently changed its api for importing Domain to FEDomain. This
fix accommodates either api.
Add coeff property

Address issue #49

Add coeff property to provide a simple way to get the influence coefficient in real space.
Merge remote-tracking branch 'upstream/elasticity' into elasticity