changend license to gnu 3

Author: konstantinstadler

.travis.yml

@@ -0,0 +1,9 @@
+language: python
+python:
+  - "3.5"
+  - "3.6"
+install:
+  - pip install pytest-pep8
+  - pip install .
+  - pip install -r requirements.txt
+script: pytest --pep8

CHANGELOG.rst

@@ -8,8 +8,19 @@ v0.3.d1 (Sep 29, 2017)
 
 - downloaders for EORA26 and WIOD
 - codebase fully pep8 compliant
-- restructured the documentation
+- restructured and extended the documentation
+  
+- License changed to GNU GENERAL PUBLIC LICENSE v3
+
+  
+API breaking changes  
+--------------------
+
+- The format for saving MRIOs changed from csv + ini to csv + json. Use the method '_load_all_ini_based_io' to read a previously saved MRIO and than save it again to convert to the new save format.
 - method set_sectors(), set_regions() and set_Y_categories() renamed to rename_sectors() etc.
+- connected the aggregation function to the country_converter coco
+- removed previously deprecated method 'per_source'. Use 'diag_stressor' instead.
+
 
 **********************
 v0.2.2 (May 27, 2016)