Fix internal fields visibility; Introduce <> operator; Allow concurrent Inventory modifications
Update Amazon billing
Remove code for cut Fortumo using.
Remove description  "Work with multiple build variant"
Fix synchronization issues with Amazon purchaseUpdates
Merge branch 'master' into master_with_fortumo

Conflicts:
	README.md
	library/src/org/onepf/oms/OpenIabHelper.java
Add fortumo classes.
Add robolectric test.
Merge pull request #320 from onepf/robolectic_test

Add robolectric test.
Resolve synchronization issue with queryInventory() request;
Work around Amazon IAB returning wrong sku value for subscriptions
Merge branch 'dev' of https://github.com/onepf/OpenIAB into Amazon_IAB_2.0_support
Fix review comments
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