maintain blocks passed to 'perform' in redirects

[bmuller]

Blocks passed to requests only get executed on the first HTTP request and don't get executed on future requests caused by a redirect.

For instance:

HTTParty.get("http://google.com") { |chunk| puts "Got a chunk: #{chunk}\n\n" }

will only print out the lines for the 301 response, but will not be run for the following request.

[jnunemaker]

A regression test to confirm that this works is all the pull needs. Without one, I'm sure I'll break it down the road.

[bmuller]

Test added. Let me know if you need anything else.

Thanks!

Brian

[bmuller]

This also fixes another issue (fixed in 3f4a2db) where response.body was returning a Net::ReadAdapter. You can see this behavior by running:

response = HTTParty.get("https://www.google.com/") { |chunk| }
response.body

The last line returns an empty Net::ReadAdapter rather than a string. This is due to calling read_body on the response if a block is present - and all subsequent calls to body will be Net::ReadAdapters rather than strings.