update readme with travis CI link and instructions for devving

Readme.md

@@ -3,6 +3,8 @@ Libsass
 
 by Aaron Leung and Hampton Catlin (@hcatlin)
 
+[![Build Status](https://secure.travis-ci.org/hcatlin/sassc.png?branch=master)](http://travis-ci.org/hcatlin/sassc)
+
 http://github.com/hcatlin/libsass
 
 Libsass is just a library, but if you want to RUN libsass,
@@ -17,6 +19,20 @@ Libsass is a C/C++ port of the Sass CSS precompiler. The original version was wr
 
 This library strives to be light, simple, and easy to build and integrate with a variety of platforms and languages.
 
+Developing
+----------
+
+As you may have noticed, the libsass repo itself has 
+no executables and no tests. Oh noes! How can you develop???
+
+Well, luckily, SassC is the official binary wrapper for 
+libsass and is *always* kept in sync. SassC uses a git submodule
+to include libsass. When developing libsass, its best to actually
+check out SassC and develop in that directory with the SassC spec
+and tests there.
+
+We even run Travis tests for SassC!
+
 Usage
 -----