Update build systems to use logback instead of log4j
Move IJStatusEchoer and ImporterProcess to logback
Remove checkLibrary call for log4j
Add logback jars
Create LogbackTools from DebugTools

Rather than attempt to do all of the logback configuration
in the ReflectedUniverse, this commits moves the LB logic
out into LogbackTools and only references those static methods
from the ReflectedUniverse. The next step will be to do this
behind a SPI interface.
Minor change to scans-dep comment on Location
Remove explicit logback from lib.dir

logback is also found in the artifacts directory
during execution causing a warning to be printed
during testing.
Migrate test-suite to use logback (or nothing)
Add small whats-new place holder
Temporarily turn configuration debugging on
Remove logback references from ImportProcess

If log4j is present in ImageJ1 and is found before
logback, then having explicit imports of logback
classes in key loci-plugins classes will prevent
Bio-Formats from working at all.

This commit follows the previous strategy of hiding
the hefty lifting in LogbackTools and just referencing
those methods safely from a ReflectedUniverse in
DebugTools.
Fix the scope of logback dependencies in Maven

The Maven build should now pass.
Remove log4j jars
Fix LogbackTools to correctly override logback's defaults
Fix logback system property in target-test-runner
Merge pull request #2 from melissalinkert/logback

Build and default logging fixes
merge dev_5_0 -D org -I include -E exclude: PR 882 (Create bioformats_package.jar)
merge dev_5_0 -D org -I include -E exclude: PR 887 (Implement pre-loading for .sdt files in the interest of performance.)
merge dev_5_0 -D org -I include -E exclude: PR 888 (MATLAB toolbox: package and release fixes)
merge dev_5_0 -D org -I include -E exclude: PR 889 (Logback conversion)