README: I've been told I should add myself to the Credits section...
let sqlalchemy handle schema creation; also pgsql
remove reference to nonexistent schema.sql in setup.
Handle cases, when code is not being run from virtualenv.
Separate requirements.txt files for different DBs

Setup fails in the absence of header files when installing a
db client.
README: Added @chooper to credits
README: update example config to use ALCHEMY_URL
Fix regression: permalink until changed each second when until=-1
README: add link to php client by @Gerifield
add gitignore
move flask debug setting into settings.py
allow env vars to override most things
add note to README about env vars
rename ALCHEMY_URL to DATABASE_URL for consistency