ModelZoo readme file for fast-rcnn includes a reference to an unreachable jenkins archive

The https://github.com/NervanaSystems/ModelZoo/blob/master/ObjectLocalization/FastRCNN/readme.md includes a reference to an internal file:
```
This set of weights was trained using the [train.py](/home/jenkins/jenkins_backup_6_2_2016.tar.gz) script for 20 epochs and reaches a mAP of 0.56 on the vaidation data set.
```