upgrade to angular 6

[hackardoX]

[codecov[bot]]

Codecov Report

Merging #274 into master will decrease coverage by <.01%. The diff coverage is 95.31%.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
- Coverage   92.13%   92.12%   -0.01%     
==========================================
  Files          25       24       -1     
  Lines        1030     1029       -1     
  Branches      146      146              
==========================================
- Hits          949      948       -1     
  Misses         53       53              
  Partials       28       28

Impacted Files	Coverage Δ
test/test.ts	100% <ø> (ø)	:arrow_up:
src/tree.module.ts	100% <ø> (ø)	:arrow_up:
src/demo/polyfills.ts	100% <100%> (ø)	:arrow_up:
src/menu/node-menu.service.ts	100% <100%> (ø)	:arrow_up:
src/tree.service.ts	98.75% <100%> (+0.03%)	:arrow_up:
src/tree.ts	92.82% <100%> (ø)	:arrow_up:
src/tree-internal.component.ts	82.97% <92.3%> (+0.09%)	:arrow_up:

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