Improve http_request resource to use net/http

[hico-horiuchi]

Use net/http on http_request resource to available DELETE. OPTIONS, POST and PUT as action .
And message that is sent by the HTTP request can be set when POST and PUT.
(Those features are same as http_request of Chef.)

For example:

http_request "/tmp/http_request_post.html" do
  action :post
  message "love=sushi"
  url "https://httpbin.org/post?from=itamae"
end

However, the test of action :options is not yet added.
(httpbin does not support OPTIONS.)

[ryotarai]

@hico-horiuchi I fixed dependency problem by 1284b84 . Would you rebase this PR?

[hico-horiuchi]

@ryotarai Thank you!