Minor improvements before next release

- Move ext-curl requirement to dev dependency as it is
  not required in all cases (only to build URIs from remote
  files)
- Clean up doc blocks

Author: Thibaud Fabre

composer.json

@@ -12,11 +12,11 @@
   ],
   "require": {
     "php"                     : ">=5.3.2",
-    "symfony/http-foundation" : "~2.0",
-    "ext-curl"                : "*"
+    "symfony/http-foundation" : "~2.0"
   },
   "require-dev": {
-    "sami/sami"               : "dev-master"
+    "sami/sami"               : "dev-master",
+    "ext-curl"                : "*"
   },
   "autoload": {
     "psr-0": {