Added features to PostLists and internal refactoring

• Added ability to dynamically update filters on the post list using bloql functions in an PostList component:

  // Filter a list of posts by tags or date
  this.props.bloql.setFilters({ tags: ['trip', 'usa'], startDate: '2015-01-01' });
  
  // Reset filters
  this.props.bloql.resetFilters();

  Example: https://github.com/adriantoine/bloql-examples/blob/master/filters/public/index.js#L10

• Changed function names for better consistency (hopefully it will be the last time I do that):

  import { setComponent } from 'bloql/Post';
  import { setComponent } from 'bloql/PostList';
  
  // become =>
  
  import { createComponent } from 'bloql/Post';
  import { createComponent } from 'bloql/PostList';

• Just like Post, PostList becomes a big customisable object, see previous release.

• This is not part of this repo/package but examples have been updated to demonstrate more features: bloql-examples