CLN: Fixups to exceptions in generic
Improved message and better exception types.

@jtratner this still relevant? close?
 I'll either close or fix this tonight.
On Oct 8, 2013 7:47 AM, "jreback" notifications@github.com wrote:

> @jtratner https://github.com/jtratner this still relevant? close?
> 
> —
> Reply to this email directly or view it on GitHubhttps://github.com/pydata/pandas/pull/5051#issuecomment-25883023
> .
 this looks fine....merge at your leisure
 @jtratner closing this?
 I'll push it to 0.14 - I think there's one item from this I want to include.
 np.
