composer: Run an install rather than update, and peg version numbers

This is a speedup for composer, as it's a bottleneck when switching
between patches frequently.

Change-Id: I2e4ab20d238671be3fe4c2a9be79b7def16a37d2

external/composer.json

@@ -4,13 +4,13 @@
         "behat/behat": "2.5.4",
         "behat/mink": "1.6.0",
 
-        "behat/mink-extension": "*",
+        "behat/mink-extension": "1.3.3",
 
-        "behat/mink-goutte-driver": "*",
-        "behat/mink-selenium2-driver": "*",
-        "fabpot/goutte": "~1.0",
+        "behat/mink-goutte-driver": "1.1.0",
+        "behat/mink-selenium2-driver": "1.2.0",
+        "fabpot/goutte": "1.0.7",
 
-        "phpunit/phpunit": "3.7.*"
+        "phpunit/phpunit": "3.7.38"
     }
 }
 

htdocs/testing/lib.php

@@ -147,8 +147,8 @@ function testing_update_composer_dependencies() {
         }
     }
 
-    // Update composer dependencies.
-    passthru("php composer.phar update --dev", $code);
+    // Install/update composer dependencies.
+    passthru("php composer.phar install", $code);
     if ($code != 0) {
         exit($code);
     }

test/behat/mahara_behat.sh

@@ -48,7 +48,7 @@ then
     else
         echo "Start Selenium..."
 
-        SELENIUM_VERSION_MAJOR=2.44
+        SELENIUM_VERSION_MAJOR=2.45
         SELENIUM_VERSION_MINOR=0
 
         SELENIUM_FILENAME=selenium-server-standalone-$SELENIUM_VERSION_MAJOR.$SELENIUM_VERSION_MINOR.jar