Removed all requirements; referring to other requirements.txt files

Also using -e to install required packages that aren't pip-installable.

requirements.txt

@@ -1,67 +1,7 @@
 # Primary requirements
-# pillarsdk
-# pillar
 # attract
 # flamenco
 
-# Secondary requirements (i.e. pulled in from primary requirements)
+-r ../pillar/requirements.txt
-algoliasearch==1.8.0
+-e ../pillar-python-sdk
-attrs==16.2.0
+-e ../pillar
-bcrypt==2.0.0
-blinker==1.4
-bugsnag==2.3.1
-bleach==1.4.3
-Cerberus==0.9.2
-cffi==1.7.0
-commonmark==0.7.2
-cryptography==1.4
-enum34==1.1.6
-Eve==0.6.3
-Events==0.2.1
-Flask==0.10.1
-Flask-Cache==0.13.1
-Flask-Script==2.0.5
-Flask-Login==0.3.2
-Flask-OAuthlib==0.9.3
-Flask-PyMongo==0.4.1
-Flask-WTF==0.12
-flup==1.0.2
-future==0.15.2
-gcloud==0.12.0
-google-apitools==0.4.11
-googleapis-common-protos==1.2.0
-html5lib==0.9999999
-httplib2==0.9.2
-idna==2.0
-ipaddress==1.0.16
-itsdangerous==0.24
-Jinja2==2.8
-MarkupSafe==0.23
-markdown==2.6.7
-ndg-httpsclient==0.4.0
-oauth2client==3.0.0
-oauthlib==1.1.2
-pathlib2==2.2.1
-Pillow==2.8.1
-protobuf==3.0.0
-protorpc==0.11.1
-pyasn1==0.1.9
-pyasn1-modules==0.0.8
-pycparser==2.14
-pycrypto==2.6.1
-pylru==1.0.4
-pymongo==3.3.0
-pyOpenSSL==0.15.1
-python-dateutil==2.5.3
-redis==2.10.5
-requests==2.9.1
-requests-oauthlib==0.6.2
-rsa==3.4.2
-scandir==1.4
-simplejson==3.8.2
-six==1.10.0
-svn==0.3.43
-WebOb==1.5.0
-Werkzeug==0.11.10
-WTForms==2.1
-zencoder==0.6.5