Better capabilities surrounding sharing

- Added flag "sharedByDefault" to ServiceManager implementation, set to
  true by default
- Disabling the flag disables storing created instances for re-use
- Used with a variety of components: Cache, Crypt, Paginator, and the
  static variants of Filter and Validator
- Cannot re-set the flag if allowOverride is false

src/PatternPluginManager.php

@@ -55,14 +55,7 @@ class PatternPluginManager extends AbstractPluginManager
      * 
      * @var array
      */
-    protected $shared = array(
-        'callback' => false,
-        'capture'  => false,
-        'class'    => false,
-        'object'   => false,
-        'output'   => false,
-        'page'     => false,
-    );
+    protected $shareByDefault = false;
 
     /**
      * Validate the plugin

src/Storage/AdapterPluginManager.php

@@ -64,20 +64,7 @@ class AdapterPluginManager extends AbstractPluginManager
      * 
      * @var array
      */
-    protected $shared = array(
-        'apc'            => false,
-        'filesystem'     => false,
-        'memcached'      => false,
-        'memory'         => false,
-        'sysvshm'        => false,
-        'systemvshm'     => false,
-        'sqlite'         => false,
-        'dba'            => false,
-        'wincache'       => false,
-        'xcache'         => false,
-        'zendserverdisk' => false,
-        'zendservershm'  => false,
-    );
+    protected $shareByDefault = false;
 
     /**
      * Validate the plugin

src/Storage/PluginManager.php

@@ -57,13 +57,7 @@ class PluginManager extends AbstractPluginManager
      * 
      * @var array
      */
-    protected $shared = array(
-        'clearexpiredbyfactor' => false,
-        'exceptionhandler'     => false,
-        'ignoreuserabort'      => false,
-        'optimizebyfactor'     => false,
-        'serializer'           => false,
-    );
+    protected $shareByDefault = false;
 
     /**
      * Validate the plugin