LRDOCS-1089 Alphabetize Ant targets
LRDOCS-1089 Add Ant target and taskdef for checking intros
LRDOCS-1089 Add Java task for checking intros
LRDOCS-1089 Make check-intros a dependency for prepare-dist target
LRDOCS-1089 Also check tutorials for intro markdown file
Merge branch 'ant-intro-check' of https://github.com/codyhoag/liferay-docs into pr-178-ant-intro-check
Merge pull request #918 from jhinkey/pr-178-ant-intro-check

Ant intro check task