LRDOCS-437 remove devGuide's preface markdown file
Merge branch 'devGuide-intro' into devGuide-update
Remove dev guide preface
Dev guide Plugins SDK chapter. Redo Ant configuration and format chapter.
Merge branch 'devGuide-update' into DEVGUIDEwordsmith
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)