LRDOCS-1004 Refactor Portlet Preferences tutorial to make instructions more generic.
LRDOCS-1004 Format to 80 columns and remove product/version/guide suffix from header IDs
LRDOCS-1004 Minor Edits
LRDOCS-1004 Create 'liferay-mvc' code dir and reference sample portlet preferences app there
Merge branch 'master' into lrdocs-1004-portlet-prefs-refactor

Conflicts:
	develop/tutorials/articles/liferay-mvc-portlet/configurable-portlet-preferences.markdown
Merge pull request #995 from codyhoag/lrdocs-1004-portlet-prefs-refactor

Portlet Prefs Refactor