Add unit test for prefetching extra results.
Add name to contributors list.
Move shared LESS rules to separate file.

I put rules that were shared between the light and dark themes into a
separate file. Now the theme files only contain colour rules while the
"core" contains trainsitions, positioning, and so forth.
Merge pull request #164 from mminer/test-extra-fetch

Test prefetch option
Merge pull request #165 from mminer/less-shared-code

Move shared LESS rules to separate file