Calculates richtext toolbar top. Fixes #265.

[hugoabernier]

Q	A
Bug fix?	[x]
New feature?	[ ]
New sample?	[ ]
Related issues?	fixes #265

What's in this Pull Request?

Added code to calculate rich text toolbar position.

[codecov-io]

Codecov Report

Merging #268 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #268   +/-   ##
=======================================
  Coverage   72.33%   72.33%           
=======================================
  Files          17       17           
  Lines         759      759           
  Branches      146      146           
=======================================
  Hits          549      549           
  Misses        163      163           
  Partials       47       47

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[estruyf]

Thanks @hugoabernier, I have successfully merged it.

About the name convention of private variables. I would like to have them without _ as the editors are smart enough. I tend to follow the following rules: https://github.com/Microsoft/TypeScript/wiki/Coding-guidelines. For now I kept it. Will have to write it down so that new components and updates should all be aligned with the same naming conventions.

[hugoabernier]

Thanks for pointing this out, I'll update the code when I submit the next update