flake8 fixes for new Python files.
Remove most of Fluidity.
Update authors
Obsolete licence file
Move python files to main directory.
Post fluidity Travis build instructions.
Post fluidity install simplification.
Pip install Firedrake!
Mark some tests as long and skip on Travis
Add shorttest target to Makefile
Remove fluidity reference from website
Merge pull request #199 from firedrakeproject/extirpate_fluidity

Remove Fluidity dependency and rearrange directory structure.