Load svg syncronous

I know this look dirty and smell of bad performances with big images.
But in asset 56  and 127 image rendering doesn't come up, the images are under the paths.
The effect of parsing the svg syncronously are not so evident in term of permormances but they are in terms of fidelty to original image.
I see that in pathgroup there is sort of ordering of the render, loading elements sync or async but putting in array with the index variable in the right place. This should allow proper rendering, but it looks like it doesn't work good.

Visual effect of this PR:
( ok don't pay attention to the nose of the bear please, is some side effect of nested transform on line position that i still didn't manage to fix )
![image](https://cloud.githubusercontent.com/assets/1194048/3622541/b606c430-0e37-11e4-86f3-13f38a86493c.png)

current fabricjs
![image](https://cloud.githubusercontent.com/assets/1194048/3622586/dc4dee06-0e38-11e4-9fd8-1a0218f5d954.png)

![image](https://cloud.githubusercontent.com/assets/1194048/3622593/0262d340-0e39-11e4-9f4d-94ca80d4959a.png)