use authority cache, http url
clenaup Makefile
Revert "if cert signature verification fails, try without authority cache"

This reverts commit a3d1faf4215b3e79f284dd284f5dfdd229f471ca.
Merge branch 'browserid-sad' of github.com:PADL/libbrowserid into browserid-sad

Conflicts:
	libbrowserid/bid_authority.c
	libbrowserid/bid_verify.c