Modify the code for NAMA algorithm

[ajaykumarsampath]

• use flag to indicate the algorithm
  -namaFlag default 0
  -globalFbeFlag default 0
  -apgFlag default 1
• break the lbfgs function such that it update the buffer depending on the flag
• namaFlag is true - update with fixed point residual
• globalFbe is true - update with gradient of the FBE

[ajaykumarsampath]

completed with the commit 1c275eb