Resolved naming conflict with java.util.Map and liqp.filter.Map.
Added h-filter (alias for the escape-filter).
Added minus- and plus-filters.
Added prepend-filter.
Added escape_once-filter.
Added strip_html-filter.
Added strip_newlines-filter.
Added truncate-filter.
Added truncatewords-filter.
Added some documentation to the filters.
Added some documentation to the tags.
Renamed Main.
Added Javadocs.
Added a test-target in the build file.
Updated COPYRIGHT
Added some examples.