adding new license file (OSL 3.0) and updating readme to ReST

added notice of license to all source files.
OSL to all except the few files we ship inside of the application folder, those are AFL.
Updated license in user guide.

incrementing next dev version to 3.0 due to licensing change
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 66eff1b..3a2990b 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -2,11 +2,21 @@
 Change Log
 ##########
 
-Version 2.1.0 (planned)
+Version 3.0 (planned)
 =======================
 
 Release Date: Not Released
 
+-  License
+
+   -  CodeIgniter has been relicensed with the Open Software License (3.0),
+      eliminating its old proprietary licensing.
+
+      -  All system files are licensed with OSL 3.0.
+      -  Config, error, and sample files shipped in the application folder are
+         licensed with the Academic Free License (3.0) to allow you to retain
+         all licensing authority over your own application code.
+
 -  General Changes
 
    -  Added an optional backtrace to php-error template.