Implemented PHP code caching in order to take advantage of byte code caches, etc.

```php
<?php

require '/Users/james/Documents/GitHub/IcecaveStudios/isolator/vendor/autoload.php';

$isolator = Icecave\Isolator\Isolator::get();

echo '.';
```

    This is ApacheBench, Version 2.3 <$Revision: 655654 $>
    Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
    Licensed to The Apache Software Foundation, http://www.apache.org/

    Benchmarking localhost (be patient).....done

    Server Software:
    Server Hostname:        localhost
    Server Port:            8000

    Document Path:          /
    Document Length:        1 bytes

    Concurrency Level:      1
    Time taken for tests:   2.653 seconds
    Complete requests:      100
    Failed requests:        0
    Write errors:           0
    Total transferred:      11200 bytes
    HTML transferred:       100 bytes
    Requests per second:    37.69 [#/sec] (mean)
    Time per request:       26.531 [ms] (mean)
    Time per request:       26.531 [ms] (mean, across all concurrent requests)
    Transfer rate:          4.12 [Kbytes/sec] received

    Connection Times (ms)
                  min  mean[+/-sd] median   max
    Connect:        0    0   0.0      0       0
    Processing:    23   26   1.8     27      31
    Waiting:       23   26   1.8     27      31
    Total:         23   26   1.9     27      31

    Percentage of the requests served within a certain time (ms)
      50%     27
      66%     28
      75%     28
      80%     28
      90%     28
      95%     29
      98%     30
      99%     31
     100%     31 (longest request)

    This is ApacheBench, Version 2.3 <$Revision: 655654 $>
    Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
    Licensed to The Apache Software Foundation, http://www.apache.org/

    Benchmarking localhost (be patient).....done

    Server Software:
    Server Hostname:        localhost
    Server Port:            8000

    Document Path:          /
    Document Length:        1 bytes

    Concurrency Level:      1
    Time taken for tests:   0.607 seconds
    Complete requests:      100
    Failed requests:        0
    Write errors:           0
    Total transferred:      11200 bytes
    HTML transferred:       100 bytes
    Requests per second:    164.63 [#/sec] (mean)
    Time per request:       6.074 [ms] (mean)
    Time per request:       6.074 [ms] (mean, across all concurrent requests)
    Transfer rate:          18.01 [Kbytes/sec] received

    Connection Times (ms)
                  min  mean[+/-sd] median   max
    Connect:        0    0   0.0      0       0
    Processing:     5    6   1.2      5      10
    Waiting:        5    6   1.1      5      10
    Total:          5    6   1.2      5      11

    Percentage of the requests served within a certain time (ms)
      50%      5
      66%      7
      75%      7
      80%      7
      90%      7
      95%      8
      98%     10
      99%     11
     100%     11 (longest request)