When multiple people first access a ZF2 powered website there is the possibility that both requests write simultaneously write a slightly different file to disk. The result can be an PHP file having a parse error.

This commit fixes this by acquiring an exclusive lock.

…condition prevention

…g-write-race-condition-prevention' into develop

Forward port zendframework#53

Forward port zendframework#51

Forward port zendframework#55

…ig-3

Allow zend-config 3.1

Forward port zendframework#49

Forward port zendframework#59

Forward port zendframework#41

Forward port zendframework#44

New `use_zend_loader` module manager option controls if Zend\Loader
should be used, it is enabled by default.
Disabling it removes dependency on zendframework/zend-loader.

This option is useful if alternative autoloading is used, eg Composer.
Setting it to false will also disable AutoloaderProvider feature.

- Within the `ModuleAutoloader` chapter, a new note documents the new
  option.

Close zendframework#4

- Needed to autoload the `ListenerTestModule` namespace.
- Needed to import that same namespace into the test case.

Close zendframework#5

Forward port zendframework#36

Conflicts:
	CHANGELOG.md

Forward port zendframework#39

Forward port zendframework#58

Conflicts:
	CHANGELOG.md

- Changes PHP requirement to make 5.6 the minimum.
- Removes PHP 5.5 and HHVM builds from the test matrix.
- Updates the test matrix to use the lowest/locked/latest strategy.

- Removes support for PHP 5.5 and HHVM
- Updates PHPUnit to the 5.7 and 6.0 series