Tweaked version constraints

composer.json

@@ -17,7 +17,7 @@
     },
     "require": {
         "php": ">=5.3.3",
-        "guzzle/guzzle": ">=3.7,<4"
+        "guzzle/guzzle": "~3.7"
     },
     "suggest": {
         "doctrine/cache": "Adds support for caching of credentials and responses",
@@ -27,11 +27,11 @@
         "symfony/yaml": "Eases the ability to write manifests for creating jobs in AWS Import/Export"
     },
     "require-dev": {
-        "doctrine/cache": "~1.0",
         "ext-openssl": "*",
-        "monolog/monolog": "1.4.*",
-        "phpunit/phpunit": "4.*",
-        "symfony/yaml": "2.*"
+        "doctrine/cache": "~1.0",
+        "monolog/monolog": "~1.4",
+        "phpunit/phpunit": "~4.0",
+        "symfony/yaml": "~2.1"
     },
     "autoload": {
         "psr-0": {
@@ -40,7 +40,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.7.x-dev"
+            "dev-master": "2.7-dev"
         }
     }
 }