Fix prevent removing last grafana admin permissions

fixedUnit for Flow:l/min and mL/min

got stranged result with decimalSIPrefix

dataproxy: Override incoming Authorization header

Prevent password reset when login form is disabled or either LDAP or Auth Proxy is enabled

Add support for offset in date histogram aggregation

Explore: Fix logging query parser for regex with quantifiers

Explore: Show logging errors from backend

Fix misspelling issues using locale US

change obj order when merging so that correct format is being used

Fix mysql $__timeFrom() and $__timeTo() should respect local time zone

Update README.md

Explore: Fix label and history suggestions

- Logging datasource sends error string directly in the message body
- allowing response body to be an error when query transaction failed
- added throw in case we ever encounter unhandled errors again (forces us to fix the issue)

- ensure that selectors have to be preceded by whitespace or line beginning
- glacing over the fact that ` {0,1}` could be a valid regexp, but we're using space as query/regexp separators anyway, so I think it's fine for now

Explore: Logging render performance

- fork promql's tokenizer (need to specify that labels context can only follow beginning of line or whitespace)
- remove unneeded syntax features
- only present history items when field is empty

- fixed typo
- moved result calculation to explore utils
- use component keys instead of componentWillReceiveProps
- require logs to have and id, to as use as Logs component key
- render delay based on row count

Add AWS/CodeBuild namespace for CloudWatch datasource

add notice to MacOS Docker user, if docker  memory limit is less than 2GiB, build process may fail when run ./node_modules/.bin/grunt build