httprl 7.x-1.5

Notes:
The redirect_code/redirect_url are string now. You can find the arrays in redirect_code_array/redirect_url_array.

Issues Fixed:
#1429264: WSOD because of suppressed D6 leftover error
#1429272: Use of undefined constant HTTP_REQUEST_FWRITE_FAIL
#1428484: Improperly formatted HTTP version cause very many malfunctions
#1427966: fwrite(): XXX is not a valid stream resource in httprl_send_request()
#1437422: Fix minor things with timers and small code optimizations.
#1444892: Some versions of PHP have issues with a lot of data going over the wire in fwrite().
#1428474: redirect_code/redirect_url are arrays, not single values like core (expected)
#1446662: stream_select timings
#1455528: Add in a readme file

Notes on the new features:
- async_connect: default is TRUE. FALSE may give more info on errors but is generally slower.