Add Mercurial to prerequisites
Add Mercurial to prerequisites

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