Philtre v.1.1

An important feature is implemented here: ability to define parameters globally for the whole chain and then pass them as parameters to filters.

Philtre v.1.0

The first stable release of Philtre.

There's not much implemented yet, and there's no much documentation there, however the library can be used with some caution. The next step would be adding validation and optimizing exchange of data, however I'll be able to get back to this project not sooner than in 3 months.