BUG: pd.Series.interpolate(method='spline') Errort Msg, #10633
Closes #10633

This a first attempt at the error messages mentioned. Not ready to merge yet but I wanted to start the conversation... 
I think I might have the error message wrong - anyone got any ideas. 

Look like I need to add a test for k - or something or am i wrong?
 I think that's ready to be merged :) 
 needs a test
 Done :) 
 pls add a whatsnew note in bug fixes
 I added a work through etc - maybe it needs an error message (another PR) for order=0 or order>=6
 Updating on the basis of your feedback. 
 I assume this one will be ok for the 0.17 release right?
 ok, pls rebase and squash. ping on green.
 Looks like this one got messed up a bit - do you have any suggestions on how to fix this?
I've tried rebasing to upstream - which is the pydata/pandas branch. 
I made the mistake here of not branching correctly from the start. 
 Actually this seems to not be running through travis. I think I pushed to the wrong location. I'll fix it later.
Todo: Push via travis correctly
 If you do 

```
git fetch upstream
git rebase -i upstream/master
git push -f origin/master
```

everything should be fine
 Upstream should be my form right? Or the pandas original one?
ᐧ

On Fri, Aug 21, 2015 at 1:17 PM, Joris Van den Bossche <
notifications@github.com> wrote:

> If you do
> 
> git fetch upstream
> git rebase -i upstream/master
> git push -f origin/master
> 
> everything should be fine
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/10800#issuecomment-133374965.

## 

Peadar Coyle
Skype: springcoilarch
www.twitter.com/springcoil
peadarcoyle.wordpress.com
 upstream should be 'pydata/pandas', origin is 'springcoil/pandas'

You can check this with `git remote -v`
 Cool thanks for that reminder.
I'll check that after work :)
ᐧ

On Fri, Aug 21, 2015 at 1:23 PM, Joris Van den Bossche <
notifications@github.com> wrote:

> upstream should be 'pydata/pandas', origin is 'springcoil/pandas'
> 
> You can check this with git remote -v
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/10800#issuecomment-133376434.

## 

Peadar Coyle
Skype: springcoilarch
www.twitter.com/springcoil
peadarcoyle.wordpress.com
 Thanks @jorisvandenbossche 
 replaced by #10880 

normally don't open a new PR as you can simply replace all of the commits. but ok for now.
 Accidentally done

On Friday, 21 August 2015, Jeff Reback notifications@github.com wrote:

> Closed #10800 https://github.com/pydata/pandas/pull/10800.
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/10800#event-389161182.

## 

Peadar Coyle
Skype: springcoilarch
www.twitter.com/springcoil
peadarcoyle.wordpress.com
