Left align breadcrumbs and add spacing

This aligns the breadcrumbs to the left but allows the breadcrumbs as a component to be centered. It also adds a bit of vertical spacing between the lines of breadcrumbs when they wrap.

![screen shot 2014-03-26 at 10 31 59](https://f.cloud.github.com/assets/66666/2522964/2d4e90c6-b4ca-11e3-921e-b00f5eceac6d.png)
![4e6307f4-adf4-4ba9-993b-bbbb257e4ca6](https://f.cloud.github.com/assets/66666/2522980/6b59be54-b4ca-11e3-9940-11dbbe6f6e63.png)

@Magnus-G I discussed the collapsing of breadcrumbs a bit with Reda and we agreed on that it might take a lot of javascript and also collapsing almost all breadcrumbs kind of makes them unusable since you can only click the first and last one. What do you think?