[docs] add sphinx documentation stucture
[spec.rst] add ts version 1 spec
[d/conf.py] let sphinx find timestream module
[d/.gitignore] add aspell backups to .gitignore
[d/index.rst] add spec.rst to table of contents
[d/conf.py] misc changes to sphinx conf.py

mostly latex options
[d/spec.rst] start section on json manifests
[d/index.rst] comment out chapters not started
[d/*.rst] add overbars to chapter headings
[d/spec.rst] fix up & add field to manifests
[docs] misc changes after rebase mess
[d/_static & _templates] add gitkeeps to keep dirs
Merge branch 'docs' into dev

Bring docs into dev branch now it's semi-stable