Changed the `migration_style` config setting to `migration_type`

Signed-off-by: Jonathon Hill <jhill@brandmovers.com>
diff --git a/application/config/migration.php b/application/config/migration.php
index 476da1b..3ea3ef9 100644
--- a/application/config/migration.php
+++ b/application/config/migration.php
@@ -39,7 +39,7 @@
 
 /*
 |--------------------------------------------------------------------------
-| Migration Style
+| Migration Type
 |--------------------------------------------------------------------------
 |
 | Migration file names may be based on a sequential identifier or on
@@ -53,7 +53,7 @@
 | to 'sequential' for backward compatibility.
 |
 */
-$config['migration_style'] = 'timestamp';
+$config['migration_type'] = 'timestamp';
 
 /*
 |--------------------------------------------------------------------------
diff --git a/system/libraries/Migration.php b/system/libraries/Migration.php
index 275aeb0..af9e530 100644
--- a/system/libraries/Migration.php
+++ b/system/libraries/Migration.php
@@ -48,11 +48,11 @@
 	protected $_migration_enabled = FALSE;
 	
 	/**
-	 * Migration numbering style
+	 * Migration numbering type
 	 *
 	 * @var bool
 	 */
-	protected $_migration_style = 'sequential';
+	protected $_migration_type = 'sequential';
 
 	/**
 	 * Path to migration classes
@@ -142,12 +142,12 @@
 		}
 		
 		// Migration basename regex
-		$this->_migration_regex = $this->_migration_style === 'timestamp' ? '/^\d{14}_(\w+)$/' : '/^\d{3}_(\w+)$/';
+		$this->_migration_regex = $this->_migration_type === 'timestamp' ? '/^\d{14}_(\w+)$/' : '/^\d{3}_(\w+)$/';
 		
-		// Make sure a valid migration numbering style was set.
-		if ( ! in_array($this->_migration_style, array('sequential', 'timestamp')))
+		// Make sure a valid migration numbering type was set.
+		if ( ! in_array($this->_migration_type, array('sequential', 'timestamp')))
 		{
-			show_error('An invalid migration numbering style was specified: '.$this->_migration_style);
+			show_error('An invalid migration numbering type was specified: '.$this->_migration_type);
 		}
 
 		// If the migrations table is missing, make it
@@ -216,7 +216,7 @@
 		foreach ($migrations as $number => $file)
 		{
 			// Check for sequence gaps
-			if ($this->_migration_style === 'sequential' AND $previous !== FALSE AND abs($number - $previous) > 1)
+			if ($this->_migration_type === 'sequential' AND $previous !== FALSE AND abs($number - $previous) > 1)
 			{
 				$this->_error_string = sprintf($this->lang->line('migration_sequence_gap'), $number);
 				return FALSE;
diff --git a/user_guide_src/source/libraries/migration.rst b/user_guide_src/source/libraries/migration.rst
index 2463961..1a73fb7 100644
--- a/user_guide_src/source/libraries/migration.rst
+++ b/user_guide_src/source/libraries/migration.rst
@@ -28,7 +28,7 @@
   helps prevent numbering conflicts when working in a team environment, and is
   the preferred scheme in CodeIgniter 3.0 and later.
 
-The desired style may be selected using the **$config['migration_style']**
+The desired style may be selected using the **$config['migration_type']**
 setting in your **migration.php** config file.
 
 Regardless of which numbering style you choose to use, prefix your migration
@@ -158,6 +158,6 @@
                                                                              version number.
 **migration_auto_latest**  FALSE                  TRUE / FALSE               Enable or disable automatically 
                                                                              running migrations.
-**migration_style**        'timestamp'            'timestamp' / 'sequential' The type of numeric identifier used to name
+**migration_type**        'timestamp'            'timestamp' / 'sequential' The type of numeric identifier used to name
                                                                              migration files.
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