Enhancement: Implement NormalizePlugin

[localheinz]

This PR

• requires composer-plugin-apin
• implements a NormalizePlugin, which provides the previously implemented NormalizeCommand
• requires composer/composer:^1.1.0

[codecov]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #3   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       18     21    +3     
=======================================
  Files             2      3    +1     
  Lines            71     79    +8     
=======================================
+ Hits             71     79    +8

Impacted Files	Coverage Δ	Complexity Δ
src/NormalizePlugin.php	100% <100%> (ø)	3 <3> (?)

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