Add new boundary condition forms
Demo advection compiles
Advection stepping now works\!
Working advection demo first order
Merge remote-tracking branch 'mandli/advection-demo'

Conflicts:
	manyclaw/common/data_structures.h
Adding new solver constructor.
Fix last of inline.
Putting back default advection to please tests.
Use test_utils for ArraysMatch.
Putting back default advection to please tests.
Putting opencl in macro.
Adding cfl calculator.
Adding authors and license
Small fixes to readme.
Fixing abs -> fabs
Fix inconsistency in typename rp_grid_params; add direction to all riemann problems.
Adding a general serial grid eval.
Adding euler via template
Making advection rp consistent with euler.
Adding donna's variables