Work around for OSX 10.10 PATH issues

This adds the `env=os.environ` option to the `subprocess.Popen` call.  It provides a decent work around for the upstream PATH problems in OS X 10.10.  

Work around for #368

See SublimeText/LaTeXTools#401 (comment) for details on how this fix works.
Same issue here: SublimeGit/SublimeGit#150

Author: bcomnes

git.py

@@ -118,7 +118,8 @@ def run(self):
                 proc = subprocess.Popen(self.command,
                     stdout=self.stdout, stderr=subprocess.STDOUT,
                     stdin=subprocess.PIPE,
-                    shell=shell, universal_newlines=True)
+                    shell=shell, universal_newlines=True,
+                    env=os.environ)
                 output = proc.communicate(self.stdin)[0]
                 if not output:
                     output = ''
@@ -346,4 +347,4 @@ def run(self, edit):
 class GitGitkThisFileCommand(GitTextCommand):
     def run(self, edit):
         command = ['gitk', self.get_file_name()]
-        self.run_command(command)
+        self.run_command(command)