Merge branch 'develop'

Conflicts:
	SpareResource/src/main/java/btrplace/model/constraint/MaxSpareNode.java
	SpareResource/src/main/java/btrplace/model/constraint/MinSpareNode.java
	SpareResource/src/test/java/btrplace/solver/choco/constraint/CMaxSpareNodeTest.java
fix checking satisfactory continuous model of MinSpareNode and MaxSpareNode constraints.
Merge remote-tracking branch 'origin/master'

Conflicts:
	SpareResource/src/main/java/btrplace/model/constraint/MaxSpareNode.java
merge develop
Merge Porting constraints to version 0.29
Fix bugs of Constraints Checkers