JCLOUDS-597: HashCode methods for Content-MD5

This works more naturally with Guava Hashing methods and immutability
provides better safety guarantees.  Also deprecate existing byte[]
methods.
NodePredicates gained static predicate SUSPENDED

Replaced hard-coded Strings in toString methods of static predicates with their enum.toString counterparts

Added test 'testNodeRunningFailsOnSuspended'

Revert "Added test 'testNodeRunningFailsOnSuspended'"

This reverts commit 2a543bfe20540bb4f10ef4f86e845a63bdbe90e3.

Removed test 'testNodeRunningFailsOnSuspended'. Added test 'testNodeSuspendedReturnsTrueWhenSuspended'.

Renamed '

Revert "Renamed '"

This reverts commit 061e9292a812066562ab47ba5eea15337fc13c3d.

Renamed 'AtomicNodeSuspended.nodeRunning' to 'AtomicNodeSuspended.nodeSuspended'.\nWhere applicable combined all calls to 'replay(Object...)' instead of the old 'replay(node);replay(computeService);'
Merge branch 'master' of https://github.com/cdancy/jclouds