Tech: rewrite of how the legend is implement, performance increase, and will make future legend enhancements easier

Graphite: added maxDataPoints override option and a help section that describes how graphite point consolidation work, Closes #5

Graph: Series hide/show toggle changed to be default exclusive, so clicking on a series name will show only that series. (SHIFT or meta)+click will toggle hide/show. Closes #1007

Merge branch 'summarize-alignToFrom' of github.com:adriensamson/grafana into adriensamson-summarize-alignToFrom

ScriptedDashboard: datasource services are now available in scripted dashboards, you can query datasource for metric keys, generate dashboards, and even save them in a scripted dashboard (see scripted_gen_and_save.js for example), Closes #991

adding templating in opentsdb graphs

Merge branch 'opentsdb-counterMax' of github.com:rsimiciuc/grafana into rsimiciuc-opentsdb-counterMax

Tech: added cache busting for requirejs fetches, will only affect config.js for optimized builds, should solve user issues where browsers cache config.js which causes initial confusing setup/config issues.

Graph: multi series tooltip fix for long series names, and metric value row alignment, Fixes #983, #984

When get_data fails the legend should be cleared

Replace all $interval occurrences in query string