Bowling Score Calculator

American Ten-Pin Bowling has a non-trivial way of calculating the score.

The rules are as follows:

each game of bowling includes 10 turns (aka "frames")
in each frame, a bowler gets 2 attempts to knock down all 10 pins
if in 2 attempts, they fail, the score for that frame is the total number of pins knocked down
if in 2 attempts, they succeed (a "spare"), the score for that frame is 10 plus the number of pins knocked down in the next roll
if on the first try, they knock all the pins down (a "strike"), the score for that frame is 10 plus the number of pins knocked down in the next 2 rolls
if a bowler gets a "spare" in the last frame (the 10th frame), they get 1 bonus roll, with the number of pins knocked down added to the score of the last frame
if a bowler gets a "strike" in the last frame (the 10th frame), they get 2 bonus rolls, with the number of pins knocked down added to the score of the last frame

Another explanation is available on Wikipedia.

Tasks

Your task is to create a function to calculate the total score in a game of American Ten-Pin Bowling.

In src/katas/bowling/core.clj, we have started you off with a function:
```
(defn total-score [rolls])
```
The input, rolls, will be a vector of integers, corresponding to the pins knocked down in each roll of a game. For example: [10 10 10 10 10 10 10 10 10 10 10 10] for a perfect game. You can assume that the input data is always valid.

In test/katas/test/bowling.clj we've provided you a reasonably-comprehensive test set.

Try to write code as you would expect from your coworkers on a non-trivial production project.
If you’d like to have us discuss your solution and compare it to others, please push your code and add a link to your repo to this spreadsheet.

^{This kata is based on [UncleBob's Bowling Game Kata](http://www.butunclebob.com/ArticleS.UncleBob.TheBowlingGameKata)}