Add api summary lists to sim docs.

[ci skip]
Reorganize model docs

Moved regression and LCM docs into one page and
transition/relocation into another page. Added documentation
on model expressions, YAML files, and control totals tables.

[ci skip]
Move urbanchoice docs page under models.

[ci skip]
Small update to the utilities page

[ci skip]
Have sim.get_table convert table sources.
Merge pull request #97 from synthicity/more-doc-updates

Model Documentation

I reorganized the model documentation so that regression/LCM share a page ("Statistical Models") and
transition/relocation share a page. I also added documentation about things like YAML files, model
expressions/formulae, and the format of control totals tables.
typos
Merge branch 'master' into high-level-docs

Conflicts:
	docs/index.rst
Merge pull request #98 from synthicity/get-table-source

Have sim.get_table convert table sources
Merge branch 'master' into high-level-docs