Delete superfluous READMEs
Don't use rstring on null values.

This change checks first if the arguments passed
to rstring are null. If so, it stores them as null
values instead of empty strings, which can later
invalidate valid strings.
Making 1 README in /examples at top level
Use null check instead of isNotEmpty().
Add wrap() and unwrap() methods to rtypes.java

As originally suggested by @ctrueden in http://git.io/0F7HXA
(DefaultOMEROService.toOMERO), these methods take or return
arbitrary graphs of object/rtypes. See http://git.io/9roMWw
for the original implementation in Python.

This implementation includes a cache so that cycles in the
graph are short-circuited.
Merge pull request #2407 from bpindelski/12056-description

Don't use rstring on null values (fix #12056).
Fix stackoverflow with an IdentityHashMap
Merge pull request #2405 from hflynn/READMEs

Delete superfluous READMEs
Merge pull request #2418 from joshmoore/un-wrap-java

Add wrap() and unwrap() methods to rtypes.java
Update dev_5_0 submodules

Repository: openmicroscopy/openmicroscopy
Already up-to-date.

Repository: openmicroscopy/bioformats
Updating c799e87..001c8a5
Merged PRs (fast-forward):
  # PR 1072 hflynn 'Adding CONTRIBUTING file to BF repo'
  # PR 1074 rleigh-dundee 'docs: Delegate all sphinx Makefile targets to ant'
  # PR 1071 hflynn 'Remove dead bitmap link'

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Updating 25ff911..cc74050
Merged PRs (fast-forward):
  # PR 765 hflynn 'Making API doc links point at release version'
  # PR 764 hflynn 'Rephrasing CONTRIBUTING re: branch for PRs'
  # PR 767 rleigh-dundee 'ant: Default all properties and handle empty vars in conf.py'
  # PR 762 rleigh-dundee 'Delegate all Makefile targets to ant'
  # PR 757 hflynn 'ticket 10030 fix - contributing file for docs repo'
  # PR 749 hflynn 'Adding API doc links to OMERO docs front page'

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