datasource-police-uk: cut the stats part, return only data.

major refucktoring
datasource-police-uk: add some serious description
Merge branch 'master' into cgg/dev
+utils.js, a file containing utility functions.

For now only contains getTheFuckingJSON function, whose name seems to be
explicit enough.
add synchronize module
datasource-police-uk: is asynchronous; actually works.
tests now run asynchronously!
add a test for datasource uk
output-crime-burst-central-london: implementation
datasource-local-police-uk: actually works.
local-police-uk: + description
police-uk: make jshint shut up
police-uk: update the description to reflect the async nature
output-crime-burst: remove outdated todo
forgot a this
Merge branch 'cgg/dev' of https://github.com/basilesimon/datastringer into cgg/dev
police-uk: handle the 'no JSON' case.
output also return their name in the callback.
datastring: ack the async design of output
output police uk: correction