updated generate_pdf(..) with reading lang code from django settings
Merge branch 'develop' of https://github.com/quamilek/InkPy into develop

Conflicts:
	src/inkpy/__init__.py
made var lang_code as a fn param
added test for _django_render fn + some changes
code cleanups
fixed test settings LANGUAGE_CODE
added set_lang method & code cleanups
updated Converter's docstring
Merge branch 'develop' of https://github.com/quamilek/InkPy into develop
Merge branch 'develop' into localized-pdf-generation

Conflicts:
	.travis.yml
added SECRET_KEY to test settings
Merge pull request #1 from xliiv/localized-pdf-generation

expanded generate_pdf with locale param