Remove non-ES5 legacy code and update repository infrastructure

v2.0.0 (2018-06-03)

Full Changelog

Merged pull requests:

• Remove non-ES5 legacy code and update repository infrastructure #14 (daffl)
• conserve Symbols #13 (bertho-zero)
• Update Mocha link #12 (mortonfox)

Performance and package manager improvements

• Updating component and bower (#6)
• Only wrap functions that are actually calling ._super (#7)
• Improved build and tests