better support for comments in requirements files

#45

pipenv/cli.py

@@ -66,7 +66,7 @@ def ensure_project(dev=False):
 
 def clean_requirement(requirement):
     """Cleans given requirement from additional data like, comments."""
-    return requirement[:requirement.index('#') - 1].strip() if ' #' in requirement else requirement.strip()
+    return requirement[:requirement.index(' #') - 1].strip() if ' #' in requirement else requirement.strip()
 
 def from_requirements_file(r):
     """Returns a list of packages from an open requirements file."""

test_pipenv.py

@@ -75,3 +75,8 @@ def test_install_from_requirements_file():
     r = open('tests/requirements_requests_socks.txt')
     dep = from_requirements_file(r)
     assert dep == ['requests[socks]']
+
+    # -e svn+svn://svn.myproject.org/svn/MyProject#egg=MyProject  # comment
+    r = open('tests/requirements_egg.txt')
+    dep = from_requirements_file(r)
+    assert dep == ['-e svn+svn://svn.myproject.org/svn/MyProject#egg=MyProject']

tests/requirements_egg.txt

@@ -0,0 +1 @@
+-e svn+svn://svn.myproject.org/svn/MyProject#egg=MyProject  # comment