LRDOCS-1134 Converted services security layer DevGuide section into a tutorial.
LRDOCS-1134 split service security layers tutorial into two tutorials.
LRDOCS-1134 created setting authentication type tutorial from service security layers tutorial.
QA edits.
Merge branch 'LRDOCS-1135' of https://github.com/mwilliams2014/liferay-docs into LRDOCS-1135-QA
Edit to Next Steps section.
LRDOCS-1135 added instruction to PHP section of Soap tutorial.