Merge pull request #93 from gtudan/ACT-1739

ACT-1739: added message boundary event support to diagram viewer
ACT-1740: Replacing newlines for status-name
try to add test case for MDC. Not working yet
REST-docs fix for job-execution + added signal with variables to REST
complete implementation of ACT-1738
Merge remote-tracking branch 'upstream/master' into act-1738
add files for act-1738
add files for act-1738
add comments
update userguide
enhance MDC documentation
Upgrading commons-lang to latest 3.1
correct typo
Adding missing parameter to include process-variables in REST
Fixed wrong parameter name
Fixed ACT-1731: eager init of binary variables when included in query
Added possibility to register custom XMLConverters (changed visibility)
Merge branch 'master' of https://github.com/discolo/Activiti
added copyBodyToCamelBodyAsString and copyVariablesFromHeader endpoint properties and modified camel body transition for Activiti Camel Producer
Fixed ACT-1686: Using exists instead of inner-join (which is way faster
than a distinct on the whole RES.* result set)