Merge branch 'feature/packaging' into develop (resolves #2)

pip_review/__main__.py

@@ -37,7 +37,7 @@ def _check_output(*args, **kwargs):
 except (ImportError, AttributeError):
     pass
 
-from pip._vendor.packaging import version as packaging_version
+from packaging import version as packaging_version
 
 
 def parse_args():

setup.py

@@ -6,7 +6,7 @@
 
 
 def get_dependencies():
-    deps = []
+    deps = ['packaging']
     if sys.version_info < (2, 7):
         deps += ['argparse']
     return deps

tests/review.t

@@ -5,6 +5,7 @@ Create a new playground first:
   $ PATH=FOO/bin:$PATH
   $ pip install --upgrade --force-reinstall 'pip' > /dev/null 2>&1
   $ pip install argparse >/dev/null 2>&1
+  $ pip install packaging >/dev/null 2>&1
   $ pip install -U --force-reinstall argparse >/dev/null 2>&1
   $ pip install -U --force-reinstall wheel >/dev/null 2>&1
   $ alias pip-review="$TESTDIR/../pip_review/__main__.py"
@@ -35,6 +36,12 @@ We can also install these updates automatically:
   $ pip-review
   cElementTree==* is available (you have 1.0.5.post20051216) (glob)
 
+Next, let's test for regressions with older versions of pip:
+
+  $ pip install --force-reinstall --upgrade pip\<6.0 >/dev/null 2>&1
+  $ pip-review
+  cElementTree==* is available (you have 1.0.5.post20051216) (glob)
+
 Cleanup our playground:
 
   $ rm -rf FOO