Lookup company

Company lookup is determined to resolve a company from its keys, similar to how many of our other apis work. The following approaches will all work to resolve a company and any of them are appropriate:

1. /companies/lookup?keys={"foo": "bar", "fizz": "buzz"}
2. /companies/lookup?keys[foo]=bar&keys[fizz]=buzz
3. /companies/lookup?foo=bar&fizz=buzz