Various improvements

[bravo-kernel]

• updates tests to support sequelize v4 and v5 (only available DataTypes are tested)
• adds Travis CI
• simplified tests

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@5e7549b). Click here to learn what that means.
The diff coverage is 95.23%.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   71.19%           
=========================================
  Files             ?       12           
  Lines             ?      302           
  Branches          ?        0           
=========================================
  Hits              ?      215           
  Misses            ?       87           
  Partials          ?        0

Impacted Files	Coverage Δ
test/models/user.js	100% <100%> (ø)
test/utils/supported-datatype.js	83.33% <83.33%> (ø)

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