limit store dep to billing
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remove whitespace
Merge pull request #5 from soomla/weakerSoomStoreDep

SKUs query result improvement
Separated restore transactions from fetching skus details
Extracted an abstract class "IabHelper" (android-store)
so we can create more IabHelpers.
Google's IabHelper is now called GoogleIabHelper.
Supporting new architecture for multiple IAB
services.
Added "build_all" script to build the jar
(will be built into "build" folder)
Build the Jar
Fixed issues and built jar
Added docs
Fixed README.md