Enable an optional username:password to be provide on the command line to generate a Basic authentication header.
Enable an optional username:password to be provide on the command line to
generate a Basic authentication header.

* test/serf_get.c:
  (main): look for a third param, base64-encode it, and pass it in the
    "Authorization:" header.

Manouchehri/serf,x-clone/serf,wzugang/serf,wzugang/serf,lazysoez/serf,google-code-export/serf,krime/serf,pengdu/serf,muthusuba/serf,zhengcq315/serf,SirJson/serf,liuzongquan/serf,google-code-export/serf,alex1818/serf,x-clone/serf,Manouchehri/serf,zhengcq315/serf,TommyU/serf,google-code-export/serf,idomon/serf,zhupan/serf,yesoce/serf,zhupan/serf,zhupan/serf,stoneCC/serf,KyleSanderson/serf,Manouchehri/serf,soufianeEL/serf,krime/serf,liuzongquan/serf,zhengcq315/serf,blueszhangsh/serf,x-clone/serf,google-code-export/serf,soufianeEL/serf,TommyU/serf,blueszhangsh/serf,liuzongquan/serf,krime/serf,justinweb/serf,SirJson/serf,TommyU/serf,KyleSanderson/serf,alex1818/serf,Manouchehri/serf,yesoce/serf,muthusuba/serf,pengdu/serf,sworda/serf,lazysoez/serf,muthusuba/serf,zhupan/serf,justinweb/serf,stoneCC/serf,pengdu/serf,sworda/serf,x-clone/serf,liuzongquan/serf,SirJson/serf,stoneCC/serf,alex1818/serf,zhengcq315/serf,soufianeEL/serf,KyleSanderson/serf,sworda/serf,blueszhangsh/serf,muthusuba/serf,lazysoez/serf,KyleSanderson/serf,sworda/serf,krime/serf,stoneCC/serf,wzugang/serf,wzugang/serf,justinweb/serf,lazysoez/serf,pengdu/serf,blueszhangsh/serf,SirJson/serf,yesoce/serf,idomon/serf,justinweb/serf,soufianeEL/serf,TommyU/serf,idomon/serf,alex1818/serf,idomon/serf,yesoce/serf