Feature/interpolate from callables

On the 2016 meeting we decided to switch to operator() syntax in interpolate(). This MR will implement this change by:

• Adding wrappers to switch between operator() and evaluate()
• Call the wrapper in any interpolate() implementation to support both versions for transition
• Adjust the virtual interface
  • Wrap passed functions if necessary to support operator()

This is the list of adjusted FE implementations:

• brezzidouglasmarini
• common (virtual interface and wrapper)
• dualmortarbasis
• hierarchical
• lagrange (despite interpolation.hh)
• meta
• mimetic
• monomial
• orthonormal
• rannacherturek
• raviartthomas (despite raviartthomassimplexinterpolation.hh)
• refined
• whitney