Vue Directive Tooltip Versions Save

Due to a feature/bug in mobile iOS/safari combo, users will have to tap twice to obtain a proper click/tap. It's not a bug per say but a feature according to Safari's devs.

Because I don't want a breaking change, I added a .ios modifier. Look at the documentation for more info.

• fix a bug that was breaking the script under IE 11
• added positions variants: start / end (ex: top.start , right.end, etc...)

updated popper.js version

• possibility to change the global default values for all tooltips
• delay to hide (in ms)
• offset (from the target in px)

The documentation has been updated to reflect the changes

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