fix issue #194: pass valid skus instead of null
expand example to support testing bulk SKUs
Merge pull request #43 from soomla/exampleBulkSKUs

expand example (multiple skus)
merge with master
proper fix for #194 on unity3d-store. query getAllProductIds instead of null.
Merge pull request #45 from lassic/fix194

Fix issue #194 (on unity3d-store)
new commits in submodule
Update changelog.md
a few changes in docs and in readme
Merge branch 'master' into docs

* master:
  Update changelog.md
  new commits in submodule
  proper fix for #194 on unity3d-store. query getAllProductIds instead of null.
  expand example to support testing bulk SKUs
  fix issue #194: pass valid skus instead of null
Changed license back to Apache and added docs for
new functions.
changed README