General editing for clarity and conciseness.  Removed the note that we already introduced the presence of a portlets folder since I did not see it.  Perhaps it was referring to the last chapter which is the Plugins SDK chapter, but I think the chapter should be a self-contained unit.
Merge branch 'DEVGUIDEwordsmith' of https://github.com/jhinkey/liferay-docs into DEVGUIDEwordsmith to see changes made and continue working on dev guide wordsmithing task
Primarily editing for conciseness and clarity, general wordsmithing. Changed 3 instances of ... etc., simply to etc. (removed ...).
Bring Jim's updated formatting from Ch 2 in and also deletion of preface. Merge branch 'DEVGUIDEwordsmith' of https://github.com/jhinkey/liferay-docs into DEVGUIDEwordsmith
Continued wordsmithing task, Ch 3.  Had a difficult time ironing out the description of the "support" element under 'A Closer Look at the My Greeting Portlet' (line 277). Stopped around line 500. A Chapter 2 formatting change was also made,for lines 100-101 (from 8-line indent down to 4)
Added PACL generation tool for dev guide plugin security chapter
Merge branch 'DEVGUIDEwordsmith' of https://github.com/rbohl/liferay-docs into DEVGUIDEwordsmith