Merge pull request #70 from vishnupillai/master

Allow faster shutdown of dir polls
Do not log if logger is null

PR67 (https://github.com/jpos/jPOS/pull/67) had an undesired
side-effect of starting logging to the default logger in situations
we really didn't want to log (i.e. a service that doesn't have an
assigned logger, on purpose).
Do not create a LogEvent if we don't have a Logger
backward compatibility after PR67

PR67 (https://github.com/jpos/jPOS/pull/67) adds a nice feature,
if we call Logger.log with a LogEvent not associated with a LogSource,
then the Logger.log implementation picks the default system Logger (Q2).

This is good, but we have situations where we define a service and do
not assign a logger, and we expected not to issue any output.

In theory, the service should check if a logger is present, but
in practice, there are many out there, in production, so we added
a backward compatibility hack, using the new 'honorSourceLogger' flag.

If we create a LogEvent passing a LogSource parameter, even if the
LogSource is null, then we set the honorSourceLogger flag and the
behavior is the same as prior to PR67.

If, on the other hand, we call the LogEvent() or LogEvent(String)
constructor, then PR67 feature is enabled.
Upgraded Gradle to 2.1

[ci skip]
Use Java instead of brainfuck in 'if' statement
doc: Some clarifications on iso8583 tutorial about the encoding of fields [ci skip]
Merge pull request #72 from barspi/master

doc: Some clarifications on iso8583 tutorial about the encoding of fields [ci skip]
doc: updating obsolete directory paths for packagers [ci skip]
Merge pull request #73 from barspi/master

doc: updating obsolete directory paths for packagers [ci skip]
Added Gitter badge
Merge pull request #74 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

[ci skip]
moved up Gitter link

[ci skip]
added String hexdump (byte[] b, int offset)
Work on TM chapter
Work on TransactionManager chapter
work on TM
Fixed table overflow
work on TM configuration
Work on TM diagram