Add support for Julia v0.6

[blegat]

Currently failing because of JuliaLang/julia#22225

[coveralls]

Changes Unknown when pulling 81cabeb on j6 into ** on master**.

[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   80.66%   80.66%           
=======================================
  Files          12       12           
  Lines         838      838           
=======================================
  Hits          676      676           
  Misses        162      162

Impacted Files	Coverage Δ
src/stats.jl	15% <ø> (ø)	⬆️
src/sddptree.jl	90% <ø> (ø)	⬆️
src/paths.jl	88.88% <ø> (ø)	⬆️
src/stopcrit.jl	91.3% <ø> (ø)	⬆️
src/cutstore.jl	75.75% <100%> (ø)	⬆️
src/node.jl	45.9% <100%> (ø)	⬆️
src/interface.jl	100% <100%> (ø)	⬆️
src/nlds.jl	82.7% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update df8258c...962fea8. Read the comment docs.

[codecov]

Codecov Report

Merging #7 into master will decrease coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   80.66%   80.59%   -0.08%     
==========================================
  Files          12       12              
  Lines         838      840       +2     
==========================================
+ Hits          676      677       +1     
- Misses        162      163       +1

Impacted Files	Coverage Δ
src/sddptree.jl	90% <ø> (ø)	⬆️
src/paths.jl	88.88% <ø> (ø)	⬆️
src/stopcrit.jl	91.3% <ø> (ø)	⬆️
src/stats.jl	22.72% <ø> (+7.72%)	⬆️
src/nlds.jl	82.7% <100%> (ø)	⬆️
src/interface.jl	100% <100%> (ø)	⬆️
src/node.jl	45.9% <100%> (ø)	⬆️
src/cutstore.jl	72.72% <100%> (-3.04%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update df8258c...962fea8. Read the comment docs.

[coveralls]

Changes Unknown when pulling 962fea8 on j6 into ** on master**.

[coveralls]

Changes Unknown when pulling 962fea8 on j6 into ** on master**.

[coveralls]

Changes Unknown when pulling 962fea8 on j6 into ** on master**.

[coveralls]

Changes Unknown when pulling 962fea8 on j6 into ** on master**.