[enh] added .map on node list
[enh] add nodelist.filter
[doc] add a TODO file
[enh] start to work on append_comma on ListNode
[enh] listnode.append_value when listnode.value.len == 0
[doc] update TODO
[mod] make repr of SpaceNode redering something visible
[fix] __setattr__ on _list_keys wasn't setting a NodeList
[enh] listnode.append_value is now working as expected (with the endl stuff)
[doc] update TODO
[mod] blank line
[enh] put comma list in Set
[mod] blank line
[mod] refactoring
[enh] nodelist.append_value on comma list now handle trailing option
[enh] add a .travis.yml