Added UPNP flag
UPNP code for N=1
Add UPNP case + Modify model_points
Add UPNP acc_test and perf_test
Updating UPNP documentation
Return the estimated focal length
Updating documentation
Updating for N=2
Updating documentation
Removing whitespaces
Removing whitespaces
Updating sanity check
Updating sanity check
Updating sanity check
Updating upnp sanity heck
Merge remote-tracking branch 'upstream/master'
Removing windows compilation crashes
Removing windows compilation crashes
Merge branch 'master' of https://github.com/edgarriba/opencv
Updating to c++ interfaces