Remove redundant file_exists() if is_readable() is also used.

Provision/Config.php

@@ -126,7 +126,7 @@ class Provision_Config {
     drush_command_invoke_all_ref('provision_config_load_templates_alter', $templates, $this);
     if (!empty($templates) && is_array($templates)) {
       foreach ($templates as $file) {
-        if (file_exists($file) && is_readable($file)) {
+        if (is_readable($file)) {
           drush_log("Template loaded A: $file");
           return file_get_contents($file);
         }
@@ -144,7 +144,7 @@ class Provision_Config {
 
         $file = $base_dir . '/' . $this->template;
 
-        if (file_exists($file) && is_readable($file)) {
+        if (is_readable($file)) {
           drush_log("Template loaded B: $file");
           return file_get_contents($file);
         }

Provision/Config/Data/Store.php

@@ -105,7 +105,7 @@ class Provision_Config_Data_Store extends Provision_Config {
     if (!$this->locked) {
       // Once we have the lock we dont need to worry about it changing
       // from under us.
-      if (file_exists($this->filename()) && is_readable($this->filename())) {
+      if (is_readable($this->filename())) {
         include($this->filename());
         $data_key = $this->key;
         if (isset(${$data_key}) && is_array(${$data_key})) {

Provision/FileSystem.php

@@ -288,7 +288,7 @@ class Provision_FileSystem extends Provision_ChainedState {
 
     $this->tokens = array('@path' => $path, '@target' => $target);
 
-    if (file_exists($path) && is_readable($path)) {
+    if (is_readable($path)) {
       if (is_writeable(dirname($target)) && !file_exists($target) && !is_dir($target)) {
         $this->mkdir($target);
         $oldcwd = getcwd();