SES-1835 : Synchronise ParserConfig in RepositoryConnectionWrapper

All calls to setDelegate will result in the parser config on the
delegate being reused

All calls to getParserConfig are identical to RepositoryConnectionBase
behaviour, so they will return the wrappers object, which should be
synchronised with the delegates after all calls to setDelegate and
setParserConfig
Merged in SES-1835 (pull request #136)

SES-1835 : Synchronise ParserConfig in RepositoryConnectionWrapper
SES-1835 patch to do check for null reference, occurs in execution of
ContextAwareConnection unit tests.
set version number in prep for release
[maven-release-plugin] prepare release 2.7.1
[maven-release-plugin] prepare for next development iteration
Bump Jackson version to 2.2.1

Relevant changes:

JACKSON-884 : JsonStringEncoder.quoteAdStringValue fails to encode ctrl chars correctly
Issue #51: JsonLocation had non-serializable field, mark as transient