WIP/ENH: publication quality topoplots

... I think this is was overdue

see the pdfs that are now possible using default params:

https://www.dropbox.com/sh/cpkk218putrifks/AAAQFTiyay1zWGcYWf7K4QFqa

you can set the resolution higher to completely close the gap between head and surface.

For the inpatient see here:

![screenshot 2014-07-07 17 33 04](https://cloud.githubusercontent.com/assets/1908618/3497479/23cbc1f4-05ec-11e4-88d9-1fa95389504f.png)

![screenshot 2014-07-07 17 31 52](https://cloud.githubusercontent.com/assets/1908618/3497484/2f1aa4da-05ec-11e4-97b7-517dd0b3ce92.png)

![screenshot 2014-07-07 17 34 50](https://cloud.githubusercontent.com/assets/1908618/3497552/c51bc720-05ec-11e4-9f0c-908c7eec4414.png)

cc @kingjr @agramfort @christianbrodbeck @t3on @jdsitt @fraimondo @jdammers @deep-introspection
why not changing the default resolution?