Start an execution engine without a new Java thread#26

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ebousse wants to merge 3 commits intomasterfrom

startSynchronous

Commits on Jul 17, 2017

[AbstractEngine] Add new method startSynchronous without thread
ebousse
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Merge branch 'master' of github.com:SiriusLab/ModelDebugging into startSynchronous
ebousse
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Remove files added by mistake when merging
ebousse
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