Task check-intros to ignore article folders that have no Markdown files.
Add Tutorials home page markdown
Add OpenSocial intro
Add preliminary Platform Frameworks intro
Add Plugins SDK intro, using text from tutorial
Move leading Raven text into section intro. Rename first tutorial to Setting Up Maven.
Add AlloyUI intro. Rename tutorial to not use a slash.
Add preliminary Liferay UI Taglibs intro
Add ADT intro, using leading text from tutorial. Move tutorial from web-content to adt section folder.
Add Service Builder tutorials section intro.
Add tutorial header IDs
Merge branch 'master' into import-tutorials-2
number header IDs
LRDOCS-1039 Changed leading header from <h2> to <h1>
Merge pull request #925 from jhinkey/import-tutorials-2

Tutorial intro files, header IDs, and check-intros task improvement