(cloudwatch) annotation support

cleanup(KairosDB): removed kairosdb from main repo, can easily be installed via as plugin via its own plugin repo, https://github.com/grafana/datasource-plugin-kairosdb, closes #3524

cleanup(influxdb_08): removed influxdb 0.8 data source as an built in official data source, moved it to an external plugin repo, https://github.com/grafana/datasource-plugin-influxdb-08,  closes #3523

closes #966

feat(plugins): removed external plugins and bundle code, not ready for master yet, will revert this commit in seperate branch

closes #2587
closes #2554

fix(graphite): minor fix to graphite query editor so it does not issue render requests for incomplete queries, fixes #3510

Add option to hide raintank share button

Fixes #2727

Conflicts:
	pkg/api/login.go
	public/app/core/routes/all.js
	public/app/core/table_model.ts
	public/app/panels/table/table_model.ts
	public/app/plugins/panels/table/editor.ts
	public/app/plugins/panels/table/table_model.ts

Disable sign out button in case of auth proxy enabled

New table panel doc