message: Updated examples/gslib/README.
diff: -1. Download gslib and untar it "inside MFEM Folder"
  +1. Download gslib and untar it at the level of the mfem folder.
  wget https://github.com/gslib/gslib/archive/v1.0.3.tar.gz
  tar -zxvf v1.0.3.tar.gz
  -now gslib should be located inside the MFEM folder
  + Now gslib should be located at the level of the MFEM folder
  2. Build gslib in serial or parallel based on MFEM build:
  make clean;make CC=gcc MPI=0
  or
  make clean;make CC=mpicc MPI=1
  -3. Build the gslib findpts example
  +3. Create a file mfem/config/user.mk, and add the line
  + MFEM_USE_GSLIB = YES
  +
  +4. Build mfem in serial or parallel, based on step 2.
  +
  +5. Build the gslib findpts example in examples/gslib.
  make exp
  or
  make exs
  