Merge branch 'master' of github.com:testobject/fastbill-java-wrapper

Conflicts:
	src/main/java/org/testobject/fastbill/CustomerService.java
	src/main/java/org/testobject/fastbill/CustomerServiceImpl.java
	src/main/java/org/testobject/fastbill/SubscriptionService.java
	src/test/java/org/testobject/fastbill/CustomerServiceTest.java
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