Added a RangeIndex constructor which takes an Iterable[RangeIndexEntry]
Separated out index and data-root locators for S3AvroIndexedParquetRDD
Adding ByteArrayByteAccess for local ByteAccess over Array[Byte]
Adding the ByteArrayFileLocator.

Used for debugging and testing, gives local access to an Array[Byte]
Adding OutputStream constructor to RangeIndexWriter

Allowing RangeIndexWriter to be wrapped around an OutputStream, which is useful
for testing in the short term.
Change the signature of addParquetFile to RangeIndexGenerator

Adding the ability to pass in a locator and a relative path to the RangeIndexGenerator method
addParquetFile, which makes it easier to generate coherent index files to use in the S3AvroIndexedParquetRDD.