One function for each group of models¬

NOT TESTED YET! Buildscript has not finished yet (needed about 18h until now).

Made `data/v2/__init__.py` and `config/local.py` python3 compatible.

Writen helper functions because of repeating code:
  + `process_csv`
  + `build_generic`
useage demonstrated with `_build_languages`.

Writen `with_iter` for closing files automatical
when the processing has finished.

Writen for each group of models a function (named `build_`groupname)
and a function `build_all` which calls these functions.

config/local.py

@@ -1,4 +1,4 @@
-from settings import *
+from .settings import *
 
 DATABASES = {
     'default': {

data/v2/__init__.py

@@ -1 +1 @@
-from build import *
+from .build import *