Reduce common URLs across places tests to attempt to eliminate test-places intermittents, a+=@gozala
Bug 901937 - Write a contributor's guide for the SDK; r=@wbamberg
Bug 901800 Clarify which version of the SDK modules are used for add-ons, and how + when to use -o; r=@mossop
Revert "Merge pull request #1142 from Gozala/bug/strip-sdk@892193"

This reverts commit cf811ad2d1f91505dfcb840c48ddb52905bfe109, reversing
changes made to 338dbdf6ef9998048744ea8ade5496a4554a9359.