ATS version 1.1

This release, which parallels Amanzi release 1.1, adds significant new functionality in a variety of physics spaces. The big new capabilities include:

1. Reliable integrated (surface and subsurface) transport, including 1st and 2nd order schemes for transport, molecular diffusion, dispersion (including tensor dispersion) and more.
2. Reactive transport through the Alquimia geochemical interface, allowing access to PFloTran and Crunch reaction networks. This is coupled with transport, allowing geochemical constraints on sources and boundary conditions, linear and nonlinear sorption, and more.
3. Much-improved support for multi scale models, including subgrid models of in-stream hyporheic exchange.
4. Support for the transport of salinity, including the effects of salinity on liquid density.
5. Preliminary support for sediment transport.

This release also includes significant improvements to the documentation of existing capabilities, and improved integration of tests through continuous integration (in the ate-regression-tests repository), and added examples (in the ats-demos repository).