move Guava back down to version 13
Revert "remove old non-Guava hash function wrapper classes"

This reverts commit 9d83523619ebe6e6093c508703f941f111286371.
Revert "change Adler-32 and CRC-32 to use Guava implementations"

This reverts commit 8fc9e0c564fe623b483dec93b0b93f0548470caa.
Revert "add endian-reverser wrapper for checksum algorithms"

This reverts commit 0d8d220ab7cfb5089e7e1751327a484970b12208.

Conflicts:
	components/common/src/ome/util/checksum/AbstractChecksumProviderReverseEndian.java
add guava/src/com/google/common/hash/HashCode.java

from https://code.google.com/p/guava-libraries/
commit hash 4232450e7bb7c46c08868f699323db3e787507c8
adjust Guava file to fit into OMERO and add notice of changes
use local copy of Guava code instead of library version

local Guava code is from a rather later version
add new algorithm to raw file store hasher map