Separate polling periods for new TwitterUsers vs updates.
Logging improvements.

Log warnings and errors to a separate file.
Use log4js config files.
Rotate logs daily and clean up after 7 days.
Update log4js config and don't use /tmp.
Log, not logs.
Restore working production log4js.json
Stop writing output to obsolete log files.
No create /data/logs on startup
Add colors to logging.
Use strict for all files.
Add more externs and type annotations

for Closure Compiler.
Add more externs.
Fix ordering of index on TwitterUsers updated/created.
Back out extern-generating changes from setup.js
Merge pull request #82 from jsha/different-update-cycles

Different update cycles
Merge pull request #86 from jsha/log-rotation

Logging improvements