LRDOCS-1528 Initial commit; copied content from https://github.com/liferay/liferay-apps-content-targeting/blob/master/DEVELOPING.markdown
LRDOCS-1528 Minor formatting
LRDOCS-1528 More formatting
LRDOCS-1528 Updated broken links to point to tutorial
LRDOCS-1528 Fixed broken links to point to tutorial
LRDOCS-1528 Fixed broken links to point to tutorial in User Guide
LRDOCS-1528 Commented out rules engine topic that has not been written yet
LRDOCS-1528 Commented out non-existing section from TOC
Fixed links.
Merge branch 'LRDOCS-1528' of git://github.com/jrao/liferay-docs into pr-1136
Merge branch 'master' of github.com:sez11a/liferay-docs