Change source directories structure to NBS default.
Merge pull request #323 from onepf/nbs_project_structure

Change source directories structure to NBS default.
Add check SKU for Nokia Store.
Merge pull request #324 from onepf/nokia_sku_check

Add check SKU for Nokia Store.
Add sku manager test.
Add sku mapping test.
Add Nokia Store SKU tests.
Merge pull request #325 from onepf/sku_manager_test

Sku manager test
Merge branch 'dev' of https://github.com/onepf/OpenIAB into Amazon_IAB_2.0_support