Merge branch '3.1'

Author: wouterj

components/asset/introduction.rst

@@ -8,6 +8,9 @@ The Asset Component
    The Asset component manages URL generation and versioning of web assets such
    as CSS stylesheets, JavaScript files and image files.
 
+.. versionadded:: 2.7
+    The Asset component was introduced in Symfony 2.7.
+
 In the past, it was common for web applications to hardcode URLs of web assets.
 For example:
 

components/cache/introduction.rst

@@ -10,6 +10,9 @@ The Cache Component
     cache to your applications. It is designed to have a low overhead and it
     ships with ready to use adapters for the most common caching backends.
 
+.. versionadded:: 3.1
+    The Cache component was introduced in Symfony 3.1.
+
 Installation
 ------------
 

components/ldap.rst

@@ -7,6 +7,9 @@ The Ldap Component
 
     The Ldap component provides a means to connect to an LDAP server (OpenLDAP or Active Directory).
 
+.. versionadded:: 2.8
+    The Ldap component was introduced in Symfony 2.8.
+
 Installation
 ------------