Move the initial sys path generation into a new project class.

jedi/evaluate/project.py

@@ -0,0 +1,24 @@
+import os
+import sys
+
+from jedi.evaluate.sys_path import get_venv_path
+
+
+class Project(object):
+    def __init__(self, sys_path=None):
+        if sys_path is None:
+            venv = os.getenv('VIRTUAL_ENV')
+            if venv:
+                sys_path = get_venv_path(venv)
+
+        if sys_path is None:
+            sys_path = sys.path
+
+        sys_path = list(sys_path)
+
+        try:
+            sys_path.remove('')
+        except ValueError:
+            pass
+
+        self.sys_path = sys_path