Use binary psycopg2 packages (#40)

Quoting its web page:
> The binary package is a practical choice for development and testing but in production it is advised to use the package built from sources.

For me right now, not having had to build psycopg2 from source would have made my life easier.

Pipfile

@@ -3,16 +3,13 @@ url = "https://pypi.python.org/simple"
 verify_ssl = true
 
 ["dev-packages"]
-
 codecov = "*"
 
 [packages]
-
 crayons = "*"
 wrapt = "*"
 pipenv = "*"
 blindspin = "*"
-"psycopg2" = "*"
 "pytest-cov" = "*"
 "webdriver-manager" = "*"
 pytest = "*"
@@ -23,3 +20,4 @@ selenium = "*"
 sqlalchemy = "*"
 pymysql = "*"
 google-cloud-pubsub = "*"
+psycopg2-binary = "*"