Generic dependency resolver. Added dependency resultion strategies.

[cmaglie]

• The dependency resolver is now based on generics (the caller is no more forced to cast his concrete types into the Dependency and Release interfaces).

• The resolution strategies have been implemented:

  // MinimumVersionRequiredStrategy is a resolution strategy where the minimum
  // required version is taken from the available set. The computed solution
  // is stable, running the algorithm again will produce the same solution even
  // if new releases becomes available in the meantime.
  const MinimumVersionRequiredStrategy ResolutionStrategy = iota
  
  // MaximumVersionAvailableStrategy is a strategy where the latest available
  // version is taken from the available set. The computed solution will have
  // all the latest possible versions of the libraries. The solution is not
  // stable, it will probably require a lock file to be able to reproduce it
  // at a later time.
  const MaximumVersionAvailableStrategy ResolutionStrategy = iota

[codecov]

Codecov Report

Merging #13 (9088832) into master (518e126) will decrease coverage by 2.39%.
The diff coverage is 66.07%.

@@             Coverage Diff             @@
##            master      #13      +/-   ##
===========================================
- Coverage   100.00%   97.61%   -2.39%     
===========================================
  Files           10       10              
  Lines          761      795      +34     
===========================================
+ Hits           761      776      +15     
- Misses           0       18      +18     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
resolver.go	78.40% <66.07%> (-21.60%)	⬇️

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[cmaglie]

Superseded by #19
Strategies need to be re-implemented.