Delete matrix.js~

I think this file is just an auto-save by Emacs.
Delete units.js~

I think this file is just an auto-save by Emacs.
Create .gitignore

Adding `.gitignore` file for unnecessary Emacs files (autosaves, etc.)
Merge pull request #3 from valera-rozuvan/patch-3

Create .gitignore
Merge pull request #2 from valera-rozuvan/patch-2

Delete units.js~
Merge pull request #1 from valera-rozuvan/patch-1

Delete matrix.js~