Merge pull request #194 from sopel/patch-1

Add pointer regarding unit tests as inner classes

Author: benjchristensen

rxjava-core/src/test/java/README.md

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+This test folder only contains performance and functional/integration style tests.
+
+The unit tests themselves are embedded as inner classes of the Java code (such as here: [rxjava-core/src/main/java/rx/operators](https://github.com/Netflix/RxJava/tree/master/rxjava-core/src/main/java/rx/operators)).
+
+* For an explanation of this design choice see 
+Ben J. Christensen's [JUnit Tests as Inner Classes](http://benjchristensen.com/2011/10/23/junit-tests-as-inner-classes/).
+
+Also, each of the language adaptors has a /src/test/ folder which further testing (see Groovy for an example: [language-adaptors/rxjava-groovy/src/test](https://github.com/Netflix/RxJava/tree/master/language-adaptors/rxjava-groovy/src/test)).