update to 0.9-beta6 language in install guide
add google spreadsheet note to tarbell install reference
expand note on data.json to cover local data.json case
remove base_templates link from index
Merge pull request #156 from eads/0.9-beta6

clean up docs
Merge pull request #157 from eads/0.9-beta6

more docs cleanup
merge my changes from last night
wip reqs
Merge branch '0.9-beta6' of https://github.com/newsapps/flask-tarbell into 0.9-beta6
adding requirement installation machinery