add support for pipenv Python dependency version pinning

adds Pipfile and Pipfile.lock with currently installed build versions used for Hack v3.003 build

Author: chrissimpkins

Pipfile

@@ -0,0 +1,20 @@
+[[source]]
+
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+
+[packages]
+
+fonttools = "*"
+fontmake = "*"
+
+
+[dev-packages]
+
+
+
+[requires]
+
+python_version = "3.6"