Upgrade to apache commons lang 3.2.2 + using FastDateFormat where appropriate
Removing obsolete files
Fix race condition in DefaultDeploymentCache (see http://forums.activiti.org/content/race-hazard-defaultdeploymentcache)
test case to show that act-1992 works fine
Image generator refactoring
more image generation refactoring
First cut of DatabaseEventLogger: alternative for history where the event mechanism is used to generate database events (as json, so they can easily be fed into a json NoSQL store). This feature is turned off by default, as its experimental.
Merge branch 'master' of https://github.com/Activiti/Activiti

# By Tijs Rademakers (10) and others
# Via Tijs Rademakers
* 'master' of https://github.com/Activiti/Activiti:
  more image generation refactoring
  Image generator refactoring
  simple workflow changes
  ACT-1988 patch
  Fix imports
  small changes to pull request 291
  Moved image generator to its own module + visual changes
  fix act-2013
  add some files for act-2013
  Script event handler + in/out variables
  Script event handler implementation (+ small in/out variables)
  fix bug-1988
  Fixed potentialStarter parse issue
  Updated potentialStarter test which covers now also the extensionElement value.
  ACT-2027 fix
  Default to JSON
Database event logger: updated scripts for all supported databases + re-enabled DatabaseEventLoggerTest
Event logger: made event logger more generic, allowing for custom (non-database) event logging.
Made event logger thread-safe.
Basic docs for event logging
Database event logging: switching EventLogEntity to integer for isProcessed (not used in Activiti - but for external usage so integer or boolean doesn't matter)
Database event logger: qa-fix for postgres (handling bytes … again)
Database event logger: qa-fix for postgres  - try 2
Postgres running, now time to fix db2
Allow to set catalog on DbSqlSessionFactory and on ProcessEngineConfiguration
QA-fix db2 (part 2)
QA-fix db2 (part 3)
Database event logger: fix Oracle qa (switch to using sequence instead of trigger)
Database event logger: fix Oracle qa (switch to using sequence instead of trigger) - part2