remove all license headers from code

[Shinigami92]

Fixes: #271

• Check the commit's or even all commits' message styles matches our requested structure.
• Check your code additions will fail neither code linting checks nor unit test.

Short description of what this resolves:

The license texts are redundant and do not add value to an MIT license
In addition, the main author and contributors can be found in the package.json and others in the README.md

Proposed changes:

• remove all header license texts

[thedaviddias]

Hi @Shinigami92, you should remove what is generating "headers" inside the grunt file too.

[codecov-io]

Codecov Report

Merging #274 into develop will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           develop   #274   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files            1      1           
  Lines            1      1           
======================================
  Hits             1      1

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