siva: implement method Get for Library and other minor changes.

[mcarmonaa]

Signed-off-by: Manuel Carmona manu.carmona90@gmail.com

[codecov-io]

Codecov Report

Merging #1 into siva will decrease coverage by 19.49%.
The diff coverage is 59.09%.

@@            Coverage Diff             @@
##             siva       #1      +/-   ##
==========================================
- Coverage   78.75%   59.25%   -19.5%     
==========================================
  Files           4        9       +5     
  Lines         273      540     +267     
==========================================
+ Hits          215      320     +105     
- Misses         34      180     +146     
- Partials       24       40      +16

Impacted Files	Coverage Δ
siva/repository.go	55.55% <0%> (ø)
siva/location.go	45.33% <100%> (ø)
siva/library.go	65.88% <60%> (ø)
util/storer.go	0% <0%> (ø)
util/iterator.go	6.49% <0%> (ø)

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