added support to use operators for assignation in ROOT R.
    Ex:
    TVector v(1);
    v[0]=1;
    r["v"]=v;
ROOTR:
Fixed compilerdata.h generation in configure
Added examples using the new overloaded operators "[]"
Some methods was renamed to adjust the code to ROOT standards
Working in cmake compilation system for ROOT R
added cmake flag for ROOTR to support rpath for the R's modules.