add templates support and new flat style option
fix colorsche.ejson path in tests
move colorscheme back to original location, add @ syntax to cli for specifying style, cache templates on server start
add myself to contributors list at bottom
new flat style: cleanup.

- The information stored in `makeImage`'s `options` parameter is better served
  in its `data` parameter,
- Remove the (no longer used) `colorscheme` parameter to `makeTemplate`,
- We can already get to the contents of the URL query parameter `style` through
  that `data` parameter in `getRequest`,
- Relocation of the code to set badge data related to the flat style into
  `getBadgeData`,
- Code style (adding semicolons).

Related to issue #159.