Add cliqueLikelihood to LikelihoodMessage and remove BeliefMessage

[Affie]

towards #459

[codecov-io]

Codecov Report

Merging #653 into master will not change coverage by %.
The diff coverage is 55.00%.

@@           Coverage Diff           @@
##           master     #653   +/-   ##
=======================================
  Coverage   63.91%   63.91%           
=======================================
  Files          36       36           
  Lines        4226     4226           
=======================================
  Hits         2701     2701           
  Misses       1525     1525           

Impacted Files	Coverage Δ
src/ParametricMessageUtils.jl	50.00% <ø> (ø)
src/TreeMessageUtils.jl	83.72% <ø> (ø)
src/BeliefTypes.jl	70.00% <50.00%> (ø)
src/JunctionTree.jl	71.58% <50.00%> (ø)
src/ParametricCliqStateMachine.jl	72.31% <50.00%> (ø)
src/ParametricUtils.jl	70.49% <66.66%> (ø)
src/JunctionTreeTypes.jl	37.38% <100.00%> (ø)

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