Remove HE Toast widget

Use our own instead.
Remove HE progress bar

No need to use it, we are styling it completely in the app.
Remove HE dialog widget

No need for it, we style it anyway.
Use ABS base theme
Replace HE Spinner

With our own implementation.
Remove dependency to HE library
Merge branch 'courier' into courier_no_HE
Merge pull request #46 from N-Pex/courier_no_HE

Remove HoloEverywhere from the project.