Update css-gencontent.json

Safari added support for pseudo element transitions/animations starting with v7 and iOS 7.
Updated CSP header usage for different browsers

Make it consistent with https://www.owasp.org/index.php/Content_Security_Policy
Merge pull request #370 from gandrewb/patch-1

Update css-gencontent.json
Merge pull request #371 from michiel3/patch-1

Updated CSP header usage for different browsers
Merge pull request #372 from kristerkari/master

Updated WebP with partial support information
data update
Update touch.json

Mozilla stop support of touch events after version 24, and since version 18 has only vendor prefixed support of touch events, see links down.

https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Events/Touch_events_%28Mozilla_experimental%29

https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Events/Touch_events
Added IE11-related known issue.

Added known issue note re: IE's continuing lack of support for CSS transforms of SVG elements.
Merge pull request #375 from sh0dow/patch-1

Update touch.json
Merge pull request #376 from orochi235/patch-1

Added IE11-related known issue.
Added link to polyfill
Merge pull request #377 from anselmh/patch-1

Added link to polyfill
Firefox Nightly starts to provide an option
::selection tested in Windows XP
data update
Merge pull request #382 from SaschaNaz/patch-15

Firefox Nightly starts to provide an option for Pointer Events
Merge pull request #383 from TheInfection/patch-1

::selection tested in Windows XP
data update
Added rem polyfill link
Flexbox known issues - minor clarifications

Added mention of IE to issue that didn't list it, re-ordered issues to put like browsers together.