Convert ASCII diagrams into proper bitmap graphics

Current version

ditaa requires the following formula to be installed:
ant 1.10.1 Java build tool

Formula history

Miguel Araújo ditaa: fix audit --warning
Mike McQuaid Use hash rockets again. (#5177)
Mike McQuaid Use Ruby 1.9+ symbol hash keys in all formulae. (#4942)
Geoff Holden ditaa 0.10
Xu Cheng ditaa: bottle unneeded
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Jaime Marquínez Ferrándiz Batch convert http download urls from SourceForge to https