minor changes
merging
Line search for prox Newton
Efficient LS, memory leaks plugged
Add fPIC
Changing Dk to Dk_tilde
copying to R package
Warm starts
copy to R package
D0 is I
Predict for k=0 fixed
copy to R
Merge pull request #6 from veeranjaneyulus/master

Backtracking line search for prox Newton