Merge pull request #68 from igor-eremeev/master

Fix NullPointerException if billing is inaccessible.
checkInventory is enabled by default. Fixed SamsungApps initialization (didn’t finish account certification)
missing return
dispose(): mAppstoreBillingService could be null
OpenIabHelper JavaDocs
unity plugin options
Fixed #72 connect Google Play Vending service to check whether billing is available
Applying Amazon moderators requirements
Merge pull request #71 from GrimReio/unity-plugin-options

+ OpenIAB.Unity uses Options
cleaned project readme update, old init marked as obsolete, ant.properties example
Merge pull request #74 from GrimReio/unity-plugin-build-update

Unity: Unity4.0 support andc leanup
Delete android-support-v4.jar

Unused in the actual code and causes problems when users try to add the library to their projects.
unity plugin demo fixes
Merge pull request #78 from silent1/master

Fixed #78 Delete android-support-v4.jar
Added: queryInventoryAsync() with subsSkus
hasAmazonClasses() return true when classes exist
Merge pull request #79 from GrimReio/unity-plugin-demo-fixes

Unity plugin demo uses Options
flagEndAsync at IABHelper.launchPurchaseFlow() https://github.com/onepf/OpenIAB/pull/83
Merge pull request #84 from oorlov/openiab-pull-83

Missing flagEndAsync at IABHelper.launchPurchaseFlow() https://github.com/onepf/...
Proxy purchase activity. Plugin package renamed