Revert "Don't install packages that could mess packaging up" (#404)

* Revert "Fix pyyaml (#402)"

This reverts commit ff949085.

* Revert "Don't install packages that could mess packaging up (#397)"

This reverts commit 5496c02f.

CHANGELOG.md

 # Python Buildpack Changelog
 
-# 106
-
-Don't install packages that could mess up packaging.
-
-- The Python buildpack will automatically remove `six`, `pyparsing`, `appdirs`,
-  `setuptools`, and `distribute` from a `requirements.txt` file now, as these
-  packages are provided by the Python buildpack.
-
-# 105
-
-Improvements to output messaging.
-
 # 104
 
 General improvements.

bin/compile

@@ -171,19 +171,15 @@ sub-env $BIN_DIR/steps/geo-libs
 # GDAL support.
 source $BIN_DIR/steps/gdal
 
-# Uninstall removed dependencies with Pip.
-let start=$(nowms)
-source $BIN_DIR/steps/pip-uninstall
-mtime "pip.uninstall.time" "${start}"
-
-# Cleanup requirements.txt
-source $BIN_DIR/steps/setuptools
-
 # Install dependencies with Pip (where the magic happens).
 let start=$(nowms)
 source $BIN_DIR/steps/pip-install
 mtime "pip.install.time" "${start}"
 
+# Uninstall removed dependencies with Pip.
+let start=$(nowms)
+source $BIN_DIR/steps/pip-uninstall
+mtime "pip.uninstall.time" "${start}"
 
 # Support for NLTK corpora.
 let start=$(nowms)

bin/steps/setuptools

-#!/usr/bin/env bash
-
-# Syntax sugar.
-source $BIN_DIR/utils
-
-puts-step "Removing packaging utilities from requirements.txt."
-
-if [[ -f requirements.txt ]]; then
-    pip-clean requirements.txt
-fi
-

vendor/pip-pop/pip-clean

-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-"""Usage:
-  pip-clean <req-file>
-
-Options:
-  -h --help     Show this screen.
-"""
-from docopt import docopt
-
-BAD_PACKAGES = ['appdirs', 'packaging', 'pyparsing', 'six', 'setuptools', 'distribute']
-
-
-def good_package(line):
-    package_name = line.split('=')[0].split('<')[0].split('>')[0].split(' ')[0].split('#')[0].split('\n')[0]
-    return package_name not in BAD_PACKAGES
-
-def main():
-    args = docopt(__doc__, version='pip-clean')
-    req_file = args['<req-file>']
-
-    with open(req_file, 'r') as f:
-        # Iterate over every line in the requirements file.
-        lines = [line for line in f if good_package(line)]
-
-    # Write the requirements file to disk.
-    with open(req_file, 'w') as f:
-        f.write(''.join(lines))
-
-
-if __name__ == '__main__':
-    main()

vendor/pip-pop/requirements.txt

-certifi==2017.4.17
-chardet==3.0.3
-dateparser
-humanize==0.5.1
-idna==2.5
-maya==0.3.2
-pendulum==1.2.1
-python-dateutil==2.6.0
-pytz==2017.2
-pytzdata==2017.2
-regex==2017.5.26
-requests==2.17.3
-ruamel.ordereddict==0.4.9
-ruamel.yaml==0.14.12
-tzlocal==1.4
-urllib3==1.21.1
-