Minor cleanups and versioning info added

cheatsheet.md

@@ -1,3 +1,13 @@
+# ChaiScript Versioning
+
+ChaiScript tries to follow the [Semantic Versioning](http://semver.org/) scheme. This basically means:
+
+  * Major Version Number: API changes / breaking changes
+  * Minor Version Number: New Features
+  * Patch Version Number: Minor changes / enhancements
+  
+
+
 # Initializing ChaiScript
 
 ```
@@ -109,6 +119,8 @@ chai.eval(R"(print("Hello World"))");
 
 ## Unboxing Return Values
 
+Returns values are of the type `Boxed_Value` which is meant to be opaque to the programmer. Use one of the unboxing methods to access the internal data.
+
 ### Prefered
 
 ```
@@ -230,6 +242,9 @@ on your platform.
 
 ## Functions
 
+Note that any type of ChaiScript function can be passed freely to C++ and automatically
+converted into an `std::function` object.
+
 ### General 
 
 ```