upgrade wayback to 1.6

current prod version is 1.4.2. from 2007
1.6 is from 2011-01-05
New features: e.g.

Memento integration.
More and better tool bars
Improved hadoop CDX generation capabilities for large scale indexes.
SWF (Flash) rewriting, to contextualize absolute URLs embedded within flash content.
NotInArchive can now optionally trigger an attempt to fill in content from the live web, on the fly.