README: simpler xapian-haystack install instructions
README: simpler xapian-haystack install instructions

Srisai85/SciPyCentral,Srisai85/SciPyCentral,wqshi/test,scipy/SciPyCentral,ksurya/SciPyCentral,scipy/SciPyCentral,wqshi/test,Srisai85/SciPyCentral,wqshi/test,scipy/SciPyCentral,ksurya/SciPyCentral,ksurya/SciPyCentral