counters for split

# Simple Counters for split.

## Usage
```
ab_counter_inc("Counter Name", "Experiment name", "Alternative name")

ab_counter_inc("PageViews", "experiment1", ab_test("experiment1", "alt1", "alt2"))
ab_counter_inc("Clickouts", "experiment1", ab_test("experiment1", "alt1", "alt2"))

# example depicted in dashboard below
ab_counter_inc("PageViews", "ctrc", ab_test("ctrc", "g", "o")) # see image
```
## Dashboard
![screen shot 2014-02-19 at 10 59 35](https://f.cloud.github.com/assets/101059/2205242/9959e5b6-994c-11e3-8efe-ef627b982b1e.png)