Added constructors
Merge pull request #244 from ekolesnikov/constructor-update

Added extra constructors to selectively prevent ExpressionManager from instantiating ExpressionFactoryImpl
Added test for ACT-1464
Merge branch 'master' of https://github.com/Activiti/Activiti
ACT-1977 fix
Increased DB id size + added REST API create process instance response test
Merge remote-tracking branch 'remote/master'