merged branch jsor/php-sapi-warning (PR sensiolabs#80)

This PR was merged into the master branch.

Discussion
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Just output a warning but don't prevent usage through non-cli SAPIs

Composer has also turned this into a warning in composer/composer@c1ff6ea

Commits
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24541e0 Just output a warning but don't prevent usage through non-cli SAPIs

Resources/bin/build_bootstrap.php

@@ -11,8 +11,7 @@
  */
 
 if (PHP_SAPI !== 'cli') {
-    echo __FILE__.' should be invoked via the CLI version of PHP, not the '.PHP_SAPI.' SAPI'.PHP_EOL;
-    exit(1);
+    echo 'Warning: '.__FILE__.' should be invoked via the CLI version of PHP, not the '.PHP_SAPI.' SAPI'.PHP_EOL;
 }
 
 $argv = $_SERVER['argv'];