.gemspec: do not declare dependency to mongodb

We're becoming modular instead, yipee.
Kolekt::Engine: use iso8601 dates

Always liked them, and so does elasticsearch.
use Require helper to simplify runnable?s, explicitely require when needed
many small fixes
Reporters::JSON, a straightforward JSON dumper
Sources::Linux*: don't mention linux

Plugins for other OSes will probably have different semantics,
but I don't want to care yet</lazy>
Sources::DpkgPackages: tiny cleanup
Sources::LinuxProcesses: collect process counts

Now we're putting some noise in there. Oh yeah.
fixed yeah yeah yeah.
big commit of the early morning

changes everywhere? check.
elasticsearch report that might work? check.
bin/kolekt: support specifying a URI

Most reporters should be able to do with something like this.
Even if they have to parse it themselves.
Reporters::ElasticSearch: use fully qualified modules
Reporters::ElasticSearch: more complete error messages
Sources::Augeas: much simpler code, doesn't seem to miss anything now
Reporters::Mongo: fixed, seems to work :)
Kolekt::{Reporters,Sources}: support for "local" code

Should make it reasonably easy to install your own reporters and sources.
Some support for gems would also be nice.