adds two scoops style requirements.txt

- added requirements directory with base, ci, prod, and dev txt file
- requirements.txt in base directory redirects to requirements/base.txt
- ci, prod, and dev all redirect to base.txt and installs their own specific packages at dhayne's discretion
- when installing packages through pip3, command is
    pip3 install -r requirements/{preferred_requirement_file}.txt
- possibly need to rewrite parts of installation wiki to accomodate, or not idk
- Closes #131

requirements.txt

-Django==1.10
-django-auth-ldap==1.2.8
-django-crispy-forms==1.6.0
-git+https://github.com/bruno207/django-qrcode.git
-flake8==3.0.4
-git+https://github.com/kstateome/django-cas.git
-git+https://github.com/bruno207/django-bootstrap3-datetimepicker.git
-gunicorn==19.6.0
-hashids==1.1.0
-mccabe==0.5.2
-mysqlclient
-pep8==1.7.0
-Pillow==3.3.0
-pyflakes==1.2.3
-pyldap
-requests==2.11.0
-simplejson==3.8.2
-wheel==0.29.0
+# This file is here because many platforms as a service look for
+# requirements.txt in the root directory of a project.
+-r requirements/base.txt

requirements/CI.txt

+-r base.txt
+flake8=3.0.4
+pep8=1.7.0
+pyflakes==1.2.3

requirements/base.txt

+Django==1.10
+django-auth-ldap==1.2.8
+django-crispy-forms==1.6.0
+git+https://github.com/bruno207/django-qrcode.git
+git+https://github.com/kstateome/django-cas.git
+git+https://github.com/bruno207/django-bootstrap3-datetimepicker.git
+hashids==1.1.0
+mysqlclient
+pyldap
+requests==2.11.0
+simplejson==3.8.2

requirements/dev.txt

+-r base.txt
+flake8==3.0.4
+pep8=1.7.0
+pyflakes==1.2.3

requirements/prod.txt

+# Pro-tip: Try not to put anything here. There should be no dependency in
+# production that isn't in development.
+
+-r base.txt
+gunicorn==19.6.0