Update EGG_NAME regular expression matcher to allow names to include dashes....

Update EGG_NAME regular expression matcher to allow names to include dashes. Fixes failing test and fixes #307.

pkg_resources/__init__.py

@@ -2267,8 +2267,8 @@ OBRACKET = re.compile(r"\s*\[").match
 CBRACKET = re.compile(r"\s*\]").match
 MODULE = re.compile(r"\w+(\.\w+)*$").match
 EGG_NAME = re.compile(
-    r"(?P<name>[^-]+)"
-    r"( -(?P<ver>[^-]+) (-py(?P<pyver>[^-]+) (-(?P<plat>.+))? )? )?",
+    r"(?P<name>.*?)"
+    r"( -(?P<ver>[^-]+) (-py(?P<pyver>[^-]+) (-(?P<plat>.+))? )? )?$",
     re.VERBOSE | re.IGNORECASE
 ).match