adds an xml memento serializer converter to intercept and restore the management context, as that is inserted in various places e.g. for DSL;
also several related fixes and tidies, moving anonymous inner classes to be named or statics, to make the memento xml a bit nicer.
updates xstream to 1.4.7. this is not needed but it seems a bit faster and friendlier (though i can't put my finger on either...).
undo the MapConverter retry-with-copy, and other items as discussed in code review
Merge pull request #1457 from ahgittin/fix-attr-when-ready-rebind-1422

Fix attr when ready rebind 1422
Add ok to last command in installPackage to force success
TypeCoercions: handle enums in wrong case
Merge pull request #1465 from aledsage/fix/coerce-enum

TypeCoercions: handle enums in wrong case
correct logic for when different webapp explicitly specified via launcher `webapp(...)`
code review comments: clean up checkSafe and add some comments
more info and "eventually" check, for test failure
Merge pull request #1466 from ahgittin/certs-and-temp

Keystore can be specified from brooklyn.properties, and tidies to use of temp dir and tidies in tests
clearer comment
Merge pull request #1463 from ahgittin/repeater-backoff

add backoff support to the `Repeater`, and leverage it in Entities. has ...
ensure effector tasks are always tagged appropriately, fixing bug where some direct invocations did not get tagged correctly and would be GC'd immediately on completion, and adding test
env vars for ssh commands on task and in gui
add an "only if service up" mode to several sensor feeds (the ones most likely to be configured ahead of time),
and just-in-time inferene for ssh-feeds with test
don't include extra output in SshFeed calls
trim strings before coercing to numbers
add support for SshFeed to take a dynamic supplier of command and environment so that these can change (eg incorporating parameters server-side or setting shell env vars to latest sensor values), plus test
entity-initializers for ssh commands (sensors and effectors) and framework for others we might want to set up, including parameters and period and env set for sensors
docs for entity intializers, ssh sensors and effectors, and example with nice integration test