Added documentaton to install, fixed windows headers to support GLPK 4.61
Added documentaton to install, fixed windows headers to support GLPK 4.61

YilunZhou/Klampt,krishauser/Klampt,krishauser/Klampt,hpbader42/Klampt,krishauser/Klampt,hpbader42/Klampt,hpbader42/Klampt,krishauser/Klampt,krishauser/Klampt,YilunZhou/Klampt,YilunZhou/Klampt,hpbader42/Klampt,krishauser/Klampt,hpbader42/Klampt,YilunZhou/Klampt