random missing docstrings
Workaround for docstrings on properties
Merge pull request #289 from firedrakeproject/missing_docs

Fix some and add some missing docstrings.
domain_data -> subdomain_data
update ufl Argument counts from -2, -1 to 0, 1
domain_type -> integral_type
domain_id -> subdomain_id
integral.measure() deprecation changes
Add ufl_domain and ufl_id to Mesh
Construct FacetNormal on domain not cell
When building finite elements, use ufl_domain not ufl_cell.
Coordinates live in domain().data().coordinates
measure().integral_type() -> integral_type()
No more integral.measure()
argument .count() -> .number()