LRDOCS-975 Add Mike Han's sandboxing content, converted to Markdown
LRDOCS-975 Rename/reorganize sections, expand intro, include more important details, add links, add main transitions
LRDOCS-975 Add captions to figures.
LRDOCS-975 Remove Advanced Runtime Options figure in order to not draw attention to it.
LRDOCS-975 Wordsmith
LRDOCS-975 Format and wordsmith the field definitions
LRDOCS-975 Wordsmith intro.
Merge branch 'sandboxing-app' of git://github.com/jhinkey/liferay-docs into sandboxing
Wordsmithing. Modified image to remove redacted portlet.
Merge branch 'sandboxing'