restored the activiti + boot unit tests.
Merge pull request #388 from joshlong/boot-tests

restored the activiti + spring boot unit tests.
Remove @Test from junit 3 tests
Fix as per https://github.com/Activiti/Activiti/commit/90fa5e5768974df08162904274546535c6559fef#commitcomment-7975412
Introducing the next generation of the job executor. Faster by great margin. Still very experimental and untested.

Still a lot todos:
- Cleanup failed jobs thread
- Exclusive jobs are not handled
- Suspend is ignored
- Unit tests
- Docs
Reverted manually commit https://github.com/Activiti/Activiti/commit/1fd11705d65efd6f47382c0f0e356189f4c8563b : restoring original job executor as we're implementing the new, improved one (see previous commit)
Fixing pom.xml of spring-boot module (fails on clean machine with fresh maven)
Fix for ACT-2107
Merge branch 'master' of https://github.com/Activiti/Activiti
New fix for ACT-2107
add badge with link to maven central
Fix for ACT-2103 : Sql bug with task query when using OR statement

Solution: switch to left outer join to get all results + add variable name non-null to filter out all 'wrong' results due to the outer join
[New job executor] Cleanup of acquire runnable
Merge branch 'master' of https://github.com/Activiti/Activiti
Merge pull request #399 from tyrcho/patch-1

add badge with link to maven central
Rest refactoring work in progress - not compiling yet
First bit of refactoring done, now testing
Bugfix for ACT-2120 JobRetryCmd doesn't use tenantId to query the activity
Merge branch 'master' of https://github.com/Activiti/Activiti
Rest module compiling + tests running green