Reservoir Sampling in C

## Benchmarking

Run on a pair of 6.3GB fastq files with 28,312,206 reads. The C was also run in memory. This was the fastest I could get the Ruby to run on a few setups.

### Ruby (from disk on local machine)

```
        user     system      total        real
    495.290000   9.410000 504.700000 (572.555838)
```

### C (from disk on local machine)

```
        user     system      total        real
   19.510000   4.140000  23.650000 (149.840868)

```

### C (in memory on high memory machine)

```
        user     system      total        real
   28.440000  15.160000  43.600000 ( 43.616507)

```