Error handling refactor

[danielnelson]

Steps:

1. Go to admin page
2. Try to create database named oh"no

Expected:
Database is created, or error displayed indicating the database name is invalid.

Actual:
Page displays "Cannot communicate with server."

Server logs contain:

time="2017-05-24T12:17:57-07:00" level=error msg="Error message received status code 400 from server: err: error parsing query: found BADSTRING, expected ; at line 1, char 22" component=server http_status =400 
time="2017-05-24T12:17:57-07:00" level=info msg="Response: Bad Request" code=400 component=server remote_addr="[::1]:59956" response_time=1.289548ms 

[goller]

@danielnelson here is one of the error sites in the code: https://github.com/influxdata/chronograf/blob/master/influx/databases.go#L25

We'll need to run the escaping algorithm used in Influxql here:

https://github.com/influxdata/influxdb/blob/master/influxql/parser.go#L2930-L2933

[nhaugo]

• Chose one common error reporting scheme
• Remove promise based errors
• Use error string when displaying errors.

See also #1301

[russorat]

we now show this which i think is ok