revival of location.query in location object

[ZeroCho]

Currently, we can access query string by location.search
I think it would be better to provide location.query which excludes ? from location.search.

For example, assume that we have a url like 'www.reactrouter.com?type=web',
location.search shows '?type=web'

and I request to have
location.query which shows 'type=web' without '?' letter.

Node.js url module also provide both location.search and location.query.
I think providing both is useful for those who parse querystring. For me, I always have to substring url to exclude ? letter, and it's quite annoying.

[timdorr]

Please see #4410. In particular, see this comment: #4410 (comment)