(Refactor) Speed up build in travisci

[dennis00010011b]

• e2e tests are splitted into six parts
• individual travis job for react components tests
• removed unused scripts from package.json
• refactored scripts in package-scripts.js
• refactored travis.yml: added cache option, job is splitted into 7 parts

[BlackDuckCoPilot]

Black Duck Security Report

Merging #1057 into 2.0 will increase security risk!

Click here to see full report

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12 component(s) did not change but have updated security data. This may affect your calculated score.

[dennis00010011b]

@vbaranov Done. Unit tests of smart-contracts for both strategies are in travici now