Add ga-beacon analytics to gendocs scripts

hack/run-gendocs.sh puts ga-beacon analytics link into all md files,
hack/verify-gendocs.sh verifies presence of link.

autoscaling.md

@@ -252,3 +252,6 @@ to prevent this, deployment orchestration should notify the auto-scaler that a d
 temporarily disable negative decrement thresholds until the deployment process is completed.  It is more important for 
 an auto-scaler to be able to grow capacity during a deployment than to shrink the number of instances precisely.   
 
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federation.md

@@ -429,3 +429,6 @@ does the zookeeper config look like for N=3 across 3 AZs -- and how
 does each replica find the other replicas and how do clients find
 their primary zookeeper replica? And now how do I do a shared, highly
 available redis database?
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high-availability.md

@@ -44,3 +44,6 @@ There is a short window after a new master acquires the lease, during which data
 
 ## Open Questions:
 * Is there a desire to keep track of all nodes for a specific component type?
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