Fix constructor for SVector{0} from Array

[c42f]

Fixes #520

[coveralls]

Coverage increased (+0.01%) to 81.717% when pulling f6c94ad on cjf/fix-zerolength-constructor into 3904426 on master.

[codecov-io]

Codecov Report

Merging #608 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #608      +/-   ##
==========================================
+ Coverage    81.7%   81.71%   +0.01%     
==========================================
  Files          39       39              
  Lines        2782     2784       +2     
==========================================
+ Hits         2273     2275       +2     
  Misses        509      509

Impacted Files	Coverage Δ
src/convert.jl	90% <100%> (+1.11%)	⬆️

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[andyferris]

Awesome :)