Add a folder for travis.
Put PHP extension installation into a shell script.
Run travis tests on HipHop Virtual Machine (hhvm).
The HHVM environment does not know phpize, so we can not install extensions.
Merge pull request #252 from bantu/travis/reorganisation

Reorganise travis configuration

* bantu/travis/reorganisation:
  Put PHP extension installation into a shell script.
  Add a folder for travis.
Merge pull request #211 from bantu/travis/hhvm

Run travis tests on HipHop Virtual Machine (hhvm).

* bantu/travis/hhvm:
  The HHVM environment does not know phpize, so we can not install extensions.
  Run travis tests on HipHop Virtual Machine (hhvm).
PHP_Compat is required when the PHP version below 4.3.3 (not above or equal).
Merge pull request #256 from bantu/fix-php-compat-description

PHP_Compat is required when the PHP version below 4.3.3 (not above or eq...

* bantu/fix-php-compat-description:
  PHP_Compat is required when the PHP version below 4.3.3 (not above or equal).