give frameworks more control over how sample tests are supplied

if a sampleTestGenerator fucntion is passed in as a framework registration
param it will be used to generate sample tests (instead of velocity hunting
around the filesystem)
Merge branch 'master' into sampleTests
imrpove sampleTestGenerator documentation
Merge branch 'master' into sampleTests

Conflicts:
	main.js
fix missing brace in jsdocs
Merge pull request #103 from meteor-velocity/sampleTests

give frameworks more control over how sample tests are supplied