Merge branch 'master' of https://github.com/onepf/OpenIAB

ter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
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# the commit.
Fix crash in LifeSample.
Refactor code.
Refactor listener in GameActivity.
Refactor work with purchase.
Refactor work with purchase.
Add docs.
Merge branch 'master' into life_sample_bugfix

Conflicts:
	library/src/org/onepf/oms/OpenIabHelper.java
Merge pull request #277 from kirich1409/life_sample_bugfix

Life sample bugfix and code refactoring.