Style improvements

https://jira.ft.com/browse/AT-2096
This versian adress the following change request from the Jira ticket:

• Mobile, spacing of text and button
• Popup, "here" needs to be underlined to indicate hyperlink

Further tweak to load performance

https://github.com/Financial-Times/n-feedback/releases/tag/v4.3.0 added support for deferred loading to n-feedback, loading the survey only when the UI is interacted with; this is a further small tweak deferring overlay creation to the same interaction instead of on load.

Remove not supported ES6 spread syntax

This caused building issues on n-ui.

Add performance optimisation

Load survey when n-feedback is clicked and show spinner while the form is loading.
Customise data what we pass from init and what we forward to qualtrics.

Fix handling for missing survey

Merge pull request #43 from Financial-Times/fix-arg-and-check-bugs

Fix missing arg and checking bugs

Fix overlay targeting

Merge pull request #41 from Financial-Times/fix/overlay-targeting

Target overlay with custom feedback class

Multi instance rendering

For App integration I had to prepare the component to render on multiple page due to the fact, App handles page swiping with a Gallery mecahnism.

Include missing styles

Merge pull request #36 from Financial-Times/fix/missing-styles

Include necessary form styles

Fix Edge FormData bug

See #35

Bumping to a major version

• N-ui's bower.json was linking to "n-feedback": "^1.0.0-beta.10"
• https://github.com/Financial-Times/n-ui/blob/master/bower.json#L32
• It turns out that you can't pin to a range of pre-releases
• So ^1.0.0-beta.10 resolves to v1.2.3
• Version v1.2.3 is over two years old. Hence the calamity.