Type stability

[nmheim]

adresses #8

I am sorry that I have not checked that before but the conditional dists were not type stable.
I had to slightly change the interface of creating CMeanGaussians, but I think it is actually nicer now:

p  = CMeanGaussian{DiagVar}(mapping, var)

no need for the T anymore, where needed we can get it from the variance :)
what do you guys think? @vitskvara @smidl @pevnak

[codecov-io]

Codecov Report

Merging #10 into master will increase coverage by 4.92%.
The diff coverage is 90%.

@@            Coverage Diff            @@
##           master     #10      +/-   ##
=========================================
+ Coverage   87.37%   92.3%   +4.92%     
=========================================
  Files           8       8              
  Lines         103     104       +1     
=========================================
+ Hits           90      96       +6     
+ Misses         13       8       -5

Impacted Files	Coverage Δ
src/abstract_cgaussian.jl	100% <ø> (ø)	⬆️
src/abstract_pdfs.jl	100% <ø> (ø)	⬆️
src/cmeanvar_gaussian.jl	100% <100%> (+23.8%)	⬆️
src/gaussian.jl	100% <100%> (ø)	⬆️
src/constspec_gaussian.jl	82.6% <50%> (-4.35%)	⬇️
src/cmean_gaussian.jl	86.95% <87.5%> (+1.95%)	⬆️
src/nogradarray.jl	75% <0%> (+25%)	⬆️

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Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.30%. Comparing base (e999bb6) to head (ceae682).
Report is 47 commits behind head on master.

Files with missing lines	Patch %	Lines
src/cmean_gaussian.jl	87.50%	1 Missing ⚠️
src/constspec_gaussian.jl	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   87.37%   92.30%   +4.92%     
==========================================
  Files           8        8              
  Lines         103      104       +1     
==========================================
+ Hits           90       96       +6     
+ Misses         13        8       -5     

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