lemire / JavaFastPFOR / 201

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Pull #39

travis-ci

Make direct buffer allocation optional

This is a minor refactoring of all codecs that directly allocate Java `ByteBuffers`: instead of making a direct call to `ByteBuffer#allocate()`, the codec invokes a protected method `makeBuffer(size)`. This allows a user to subclass the codec and override the method to customize the buffer allocation.

In particular, this enables users to use heap-buffers and/or buffer pooling. The latter is essential for reducing memory churn.

In a JVM benchmark (not included) on some real-world data, this refactoring did not decrease performance. (Notice that dropping `final` from some classes does not stop the JVM from inlining, such as in [monomorphic callsites](https://shipilev.net/blog/2015/black-magic-method-dispatch/).)

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