v2.0: Merge pull request #8 from davigbr/master

Guideline 'one tension at a time' made more clear and moved to the Tension List section
Structural changes renamed to Organizational Structure updates
Removed redundant phrase.
Fixed bug that allowed removal of double linking
Preface rewritten
Bolds and italics to make some defined concepts more easily detectable
Added links to the Pattern Library
Added Organizational Structure part to remove redundancy of mentioning in multiple parts that something can be changed only inside Adapt Mode
Added the Duties section to make the golden rule more clear, along with the no implicit expectations rule, which was not mentioned