Make it possible to override timeouts

Merge :post-opts / :get-opts client parameter in post-points / get-query so that the socket and connection timeouts can be overriden.
Fix get-dbs URL

Using InfluxDB version 0.8.3, the call to list all databases should go to /db, not /dbs. I don't know if this was modified in recent versions of InfluxDB.
Revert "Make it possible to override timeouts"

This reverts commit de4661e28d031e4de6361e5ab474112df984eb5e.
Merge pull request #11 from rborer/configurable-timeouts

Make it possible to override timeouts
Merge pull request #12 from rborer/fix-get-dbs

Fix get dbs
Add @rborer to contributors
Bump to v0.3.1