Added a .gitignore file for the build folder.
Various cleaning ups.
Unset html_static_path (and thus removed a warning about _static not being present).
Update roadmap.rst

Making it clear for Randall that units were not left off the list of objects intentionally.
Change completion date of Milestone 0.
Merge pull request #7 from hsorby/master

Change completion date of Milestone 0.
Merge pull request #6 from nickerso/master

Looks good.
Merge branch 'master' of github.com:opencor/libcellml (closes #5).