[mod] special repr of Node and NodeList

Allows for easier debugging when launched in script mode
[fix] remove unused import
[mod] new representation
[mod] prettify output with angle brackets
get up-to-date changelog
[doc] update changelog
get latest changelog
[mod] truncate node's dumps in repr
[mod] add parent's class and id
Merge pull request #23 from Psycojoker/reprprint

[mod] special repr of Node and NodeList