MrSGUIDE 0.1.2

• Fix a bug in both regression and importance variable, when y is single response.

MrSGUIDE 0.1.1

• Fix a bug in regresion.cpp

MrSGUIDE 0.1.0

• Add MrSFit function to build a tree for subgroup identification
• Add MrSImp function to calculate importance score
• Put plotTree as suggested function