Fix on severval bugs and typos

I did a review and fixed many bugs that appeared on the last months:

* Fix on Lee Gillentine's commit 2ac200e
  * Cannot read property 'values' of undefined nv.d3.js:8498
  * Cannot read property 'values' of undefined nv.d3.js:8511
* Fix on twolf's commit 8e0160a  [StackOverflow report](http://stackoverflow.com/questions/13326819/strange-error-in-chromium-during-development) and [issue 12](https://github.com/novus/nvd3/issues/12)
  * Problem parsing d="MZ" error
* Fix name clash on Fisheye components