Update requirements

requirements/requirements.txt

-Django
-django-bootstrap3
-Pillow
-djangorestframework
+Django==1.11
+django-bootstrap3==8.2.2
+Pillow==4.1.0
+djangorestframework==3.6.2
 ForgeryPy
 openpyxl==2.4.0
-celery
-paramiko
-ansible
-django-simple-captcha
-django-formtools
-sshpubkeys
-djangorestframework-bulk
-django-redis-cache
-requests
-itsdangerous
+celery==4.0.2
+paramiko==2.1.2
+ansible==2.2.2.0
+django-simple-captcha==0.5.5
+django-formtools==2.0
+sshpubkeys==2.2.0
+djangorestframework-bulk==0.2.1
+django-redis-cache==1.7.1
+requests==2.13.0
+itsdangerous==0.24
 eventlet
-django-filter
-passlib
-ForgeryPy
+django-filter==1.0.2
+passlib==1.7.1