refactor/2.0.0-dev added 'overrides' to tests
refactor/2.0.0-dev added tests for discreteBar & discreteBarChart
refactor/2.0.0-dev added tests for historicalBar & historicalBarChart
Merge pull request #553 from kashesandr/changes-pack-2

Changes pack 2
refactor/2.0.0-dev
Added override in test configs
some tests passed
refactor/2.0.0
interactiveLine was rewritten,
small changes
refactor/2.0.0
test for `renderGuideLine` method passed
refactor/2.0.0
tests for bullet model.
`color` method moved to Layer, `color` method small changes somewhere
refactor/2.0.0
tests for bulletChart model
refactor/2.0.0
tests for linePlusBarChart model
Merge pull request #558 from kashesandr/changes-pack-3

Changes pack 3
Merge pull request #556 from joeybaker/UMD

Add UMD support for AMD, CommonJS, and globals
Merge remote-tracking branch 'upstream/refactor/2.0.0-dev' into release