pipfile: Continue pipenv support, but rely on setup.py for dependencies.

Continue to support use of pipenv for development installation and venv
management, but rely upon setup.py for centralized dependencies.

Thanks to Anders Kaseorg for this suggestion.

Author: neiljp

Pipfile

@@ -4,25 +4,7 @@ url = "https://pypi.python.org/simple"
 name = "pypi"
 
 [packages]
-urwid = "~=2.1.2"
-zulip = ">=0.7.0"
-urwid-readline = ">=0.12"
-beautifulsoup4 = ">=4.9.0"
-lxml = ">=4.5.2"
-typing_extensions = ">=3.7"
-python-dateutil = ">=2.8.1"
-tzlocal = ">=2.1"
+zulip-term = {editable = true, path="."}
 
 [dev-packages]
-pytest = "==5.3.5"
-pytest-mock = "==1.7.1"
-pytest-cov = "==2.5.1"
-flake8 = "==3.7.9"
-flake8-quotes = "==3.0.0"
-flake8-continuation = "==1.0.5"
-pudb = "==2017.1.4"
-snakeviz = "==0.4.2"
-gitlint = "==0.10.0"
-isort = "~=5.6.0"
-autopep8 = "~=1.5.4"
-autoflake = "~=1.3.1"
+zulip-term = {editable = true, extras=["dev"], path="."}