Baron

------------------

- fix: the string was having a greedy behavior on grouping the string tokens
surrounding it (for string chains), this ends up creating an inconsistancy in
the way string was grouped in general
- fix: better number parsing handling, everything isn't fixed yet
- make all (expected) errors inherit from the same BaronError class
- fix: parsing fails correctly if a quoted string is not closed

----------------

- FST structure modification: def_argument_tuple is no more and all arguments
now have a coherent structure:
* def_argument node name attribute has been renamed to target, like in assign
* target attribute now points to a dict, not to a string
* old name -> string are now target -> name_node
* def_argument_tuple is now a def_argument where target points to a tuple
* this specific tuple will only has name and comma and tuple members (no more
def_argument for name)
- new node: long, before int and long where merged but that was causing problems

------------------

- fix whitespace duplication when using .insert()
- DecoratorProxyList of the last method of a function wasn't handling correctly the indentation of its last endl token

----------------

- rename "funcdef" node to "def" node to be way more intuitive.

----------------

- new rendering type in the nodes_rendering_order dictionary: string. This
remove an ambiguity where a key could be pointing to a dict or a string, thus
forcing third party tools to do guessing.

------------------

- setup.py wasn't working if wheel wasn't used because the CHANGELOG file
wasn't included in the MANIFEST.in