start examples for custom tags
update still package
add poperties to member, lexer to tags for custom tag docs
add special parser callback types
start examples for custom tags
update still package
add poperties to member, lexer to tags for custom tag docs
add special parser callback types
move custom tags docs to new extending page
pave way for custom filters in extending page
Merge branch 'docs/custom-tags' of github.com:paularmstrong/swig into docs/custom-tags

Conflicts:
	Makefile
	docs/docs/tags.html
whitespace
add docs for custom filters
Filters work over arrays/objects if possible. Fixes gh-259
add sort filter
make reverse filter an alias for sort(true)