New checks: UseInitNotReverseTailReverse, UseLastNotReverseHead

[vdichev]

Two new checks:

• coll.reverse.tail.reverse can be rewritten as coll.init
• coll.reverse.head can be rewritten as coll.last

[HairyFotr]

Thanks for contributing! :+1:

I ran grep over some code and found a list.reverse.headOption, so I've added that to UseLastNotReverseHead, and I've limited the checks to Scala collections and arrays.

[vdichev]

Good point, operations with reverse might make more sense in something like a banker's queue, e.g. https://github.com/djspiewak/scala-collections/blob/master/src/main/scala/com/codecommit/collection/BankersQueue.scala