PHP-159 - Fix composer dependencies (#117)

Author: mpenick

.gitignore

@@ -11,4 +11,5 @@
 # Files to ignore
 /cassandra.log
 /composer.phar
+/composer.lock
 /tmp/*

composer.json

@@ -23,9 +23,11 @@
       "homepage": "http://avalanche123.com"
     }
   ],
+  "require": {
+    "php": ">=5.6.0",
+    "ext-cassandra": "^1.0.0"
+  },
   "require-dev": {
-    "php": ">=5.5.0",
-    "ext-cassandra": "*",
     "behat/behat": "~3.0.6",
     "phpunit/php-code-coverage": "~2.0",
     "phpunit/php-token-stream": "~1.3",