make the date selection a range
make grep input more flexible and changes to date range
update readme on grep
better messaging
fix bug in searching live log files
fix for fetching active tasks as well as historical
Merge pull request #367 from HubSpot/logfetch_features

Logfetch features
ensure requests are not cleaning during post
thread checker should use no op logger
fix some process mgmt stuff in preparation

of minor refactor to simplify process manager
Merge branch 'master' into hs_staging