fix(getStyles): styles-as-properties priority

[atticoos]

What: #35 styles-as-properties had lower priority than style property

<glamorous.View
  style={{backgroundColor: 'green'}}
  backgroundColor="blue"
/>
// should have `blue` background

Why: The styles-as-properties should have the highest priority

How: These are now the last styles added to the component's style array

[codecov-io]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   89.74%   89.74%           
=======================================
  Files          10       10           
  Lines         117      117           
  Branches       36       36           
=======================================
  Hits          105      105           
  Misses          8        8           
  Partials        4        4

Impacted Files	Coverage Δ
src/get-styles.js	100% <100%> (ø)	⬆️

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