Disable Introscope Agent Framework

Previously, the Introscope Agent Framework was enabled by default.
Since there is no repository where the Introscope can be downloaded,
attempting to package while it was enabled caused a failure.  This
change makes no code changes, but disables the framework by default.
The documentation has also been updated to reflect this fact.

[resolves #180]

Author: nebhale

config/components.yml

@@ -33,7 +33,7 @@ jres:
 
 frameworks:
   - "JavaBuildpack::Framework::AppDynamicsAgent"
-  - "JavaBuildpack::Framework::IntroscopeAgent"
+# - "JavaBuildpack::Framework::IntroscopeAgent"
   - "JavaBuildpack::Framework::JavaOpts"
   - "JavaBuildpack::Framework::JrebelAgent"
   - "JavaBuildpack::Framework::MariaDbJDBC"

docs/framework-introscope_agent.md

@@ -1,5 +1,5 @@
 # Introscope Agent Framework
-The Introscope Agent Framework causes an application to be automatically configured to work with a bound [Introscope service][].
+The Introscope Agent Framework causes an application to be automatically configured to work with a bound [Introscope service][].  **Note:** This framework is disabled by default.
 
 <table>
   <tr>