Dashboard schema simplifications, moved schema updates to dashboard model creation, removes irritating 'unsaved changes' dialogs that show for dashboard schema changes, Closes #532

Fix for InfluxDB temp dashboards, seperate series name prefix so they do not show up in dashboard search, #633

Refactoring temp dashboard settings, and handling, moved from dashboard to config.js, defaults are enabled, and ttl of 30 days, #641, #638

Graphite: Fix for graphite expressions parser failure when metric expressions starts with curly brace segment, Fixes #528

Filtering: Fix for nested filters, changing a child filter could result in infinite recursion in some cases, Fixes #628

added saving and showing temp searches also trailing comman in default.json was causing the default to fail to load for me, #633

cleanup of 'loader' settings, removed loader.save_elasticsearch, loader.load_elasticsearch. Save/Load is default enabled and will use any datasource marked with grafanaDB: true property

Changed opentsdb metric option chartLabel to Alias to better conform to grafana naming, updated changelog with PR #618 info

Changed dashboard urls from /dashboard/elasticsearch/<title> to dashboard/db/<title>, old urls will still work

y axis unit is already upscaled automatically, this commit adds
automatic downscale.
It also fixes the number of decimals displayed (0 -> decimals)

Search: max_results config.js option & scroll in search results (To show more or all dashboards), Closes #631