Visual story: Added support for 3 default themes

Ticket - https://github.com/quintype/ace-planning/issues/349

Bugfix: incompatableBanner crashes if node version is less than 11

amplib was using function array.flatMap() that works on node version 11 and above. Some publishers are on node 10, and so amp pages were crashing for those publishers.
As a fix, replaced array.flatMap() with lodash flatten

move isAmpSupported to amplib

This release adds a helper function which takes a story object and checks if all the story elements in it are supported by amplib. If not supported, show the banner on top
quintype/framework also uses this helper function to decide whether to render amp page or to redirect to non-amp page

Fire GA on event `amp-next-page-scroll` for infinite scroll

Fixes https://github.com/quintype/ace-planning/issues/228
Request GA pageview on amp-next-page-scroll event instead of on visible event if infinite scroll is present.
This is because google AMP has a bug because of which GA doesn't get fired correctly inside infinite scroll if triggered on event visible

Override RelatedStories and Nested Submenu

0.1.26

Bump package version

Stable release with a few config fixes

v1.0.23

chore(amp): Bump up version

Pre - release for Vikatan testing

• Render text story for any template
• font sizes fix
• Navbar hamburger icon color
• convert unix timestamp to IST
• Unsupported story elements banner fix
• adding color and valid href to links
• analytics

ampifyStory returning a string again

v1.0.7

bump to 1.0.7

Custom templates, new components

Ad story elements, atoms & molecules, ampify-story can take custom story templates

Initial release

1.0.0

Bump package version