BUG fix imagick interface and add to travis

.travis.yml

@@ -29,6 +29,7 @@ matrix:
       env: DB=MYSQL BEHAT_TEST=1
 
 before_script:
+ - printf "\n" | pecl install imagick
  - composer self-update || true
  - phpenv rehash
  - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support

filesystem/GD.php

@@ -108,6 +108,7 @@ class GDBackend extends Object implements Image_Backend {
 
 	/**
 	 * @param string $filename
+	 * @param string $manipulation
 	 * @return boolean
 	 */
 	public function imageAvailable($filename, $manipulation) {

filesystem/ImagickBackend.php

@@ -99,9 +99,10 @@ class ImagickBackend extends Imagick implements Image_Backend {
 	 * @todo Implement memory checking for Imagick? See {@link GD}
 	 *
 	 * @param string $filename
+	 * @param string $manipulation
 	 * @return boolean
 	 */
-	public function imageAvailable($filename) {
+	public function imageAvailable($filename, $manipulation) {
 		return true;
 	}
 

model/Image_Backend.php

@@ -115,6 +115,7 @@ interface Image_Backend {
 	 * imageAvailable
 	 *
 	 * @param string $filename
+	 * @param string $manipulation
 	 * @return boolean
 	 */
 	public function imageAvailable($filename, $manipulation);