Add an OpenTSDB datasource.

This adds support for querying OpenTSDB for metric data.
Modified metricKeys to handle multiple graphite sources.

This wasn't all too hard to change, I mostly changed the
single http get to multiple http gets, one for each data
source of type graphite.

It's still not a good idea to call this on the web
frontend, since the whole thing was working for about
20 - 30 minutes when I clicked it, so I'm not
committing my changes to settings.js or the view itself.
Change InfluxDB SQL generation template to wrap column names in quoutes

Since column names can contain dots or dashes, which will give syntax errors from InfluxDB API, unless wrapped in quoutes
Merge pull request #369 from jbripley/influxdb-columnname-escape

Change InfluxDB SQL generation template to wrap column names in quoutes
updated changelog with PR #369
Extracted multi-graphite query function, fixed loadRecursive

The new function in metricKeys generalizes what my loadAll
from the previous commit did, it takes a request and a
callback. The request is executed on each graphite installation
and the callback is executed for each result. This makes
implementing loadAll and loadRecursive almost as simple as
it was.
InfluxDB Filters: added function to generate filter list.
InfluxDB Filters: added filter to queries.
Improvement to series toggling, CTRL+MouseClick on series name will now hide all others (Closes #350)
updated readme.md with new grafana organization urls
Added nanosecond y-scale formatting
trying to get more unit tests working
Default to auto scaling for grid min setting

fixes #226
use the influxdb built in time precision
Quote timeseries names to be able to have special character such as @ in a seriename.
Quote timeseries names to be able to have special character such as @ in a seriename.
Merge pull request #382 from ktoso/nanos-formatting

Added nanosecond y-scale formatting
url decode metric names #327
small change to influxdb template to support older versions of influxdb
Merge branch 'master' of github.com:torkelo/grafana