Better comments around extensions/models #142

Job	Run time
extensions (java)	6s
library_sources_extensions (java)	5s
extensions (csharp)	5s
library (python)	6s
library (csharp)	6s
library (java)	5s
library (go)	5s
library (cpp)	5s
library (javascript)	4s
queries (go)	6s
queries (csharp)	5s
library (ruby)	7s
queries (python)	5s
queries (java)	5s
queries (ruby)	8s
queries (javascript)	4s
library_sources_extensions (csharp)	6s
queries (cpp)	7s
	1m 40s

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