query: support for recent date literals

implemented recent created/modified queries.

Implements #23
docs: added customizing guide
api: added search route
api: don't fail in get_url

handle contents without api_url gracefully.
Provide global search over all contents
docs: remove modules and indexes
build system: updated development buildout
api: added logging message
testing: started unittests
removed bitrot
api: removed explicit request usage

the request module can handle this now implicitly.
tests: added unittests for api and request module
docs: added more parameters to docs
updated docs
updated docs
api: implemented children api
preparing next version
updated doc code example
api: added portal route

added adapter for ISiteRoot.
added route provider.
added record api.
api: added content route
adapter: updated adapter data