LB-1769 Emulate options in liveblog.

Add emulateOLDHEADERS option to add the headers like they are in old
liveblog.
Add emulateHEADERSASPARAMS to convert headers to GET params.

Change rp to support liveblog.emulateOLDHEADERS.
Merge pull request #178 from nistormihai/rp-new-post-issue

LB-1769 Emulate options in liveblog.