chore(*): start branch for 4.0 site update

This currently includes adjustments for templating.
Merge branch 'gh-pages' into feature/4.0-site-update

Conflicts:
	fine-uploader-basic-demo.html
	fine-uploader-demo.html
	fine-uploader-with-jquery-wrapper-demo.html
	index.html
	source/all.fineuploader-3.9.1.min.js
	source/fineuploader-3.9.1.min.css
	source/fineuploader-3.9.1.min.js
	source/jquery.fineuploader-3.9.1.min.js
chore(*): remove 3.9.1 source files from merge
feat(*): #868, #869 - update S3 demo on fu.com to use thumbnails feature
feat(*): #868, #869 - update thumbnail/preview demos

[skip ci]
docs(*): demo cleanup

- remove all jQuery from non-jQuery demos
- fix various typos

[skip ci]
chore(*): upgrade to 4.0.0 pre-release 1

[skip ci]
chore(*): link to templates

[skip ci]
chore(*): forgot to check new files into version control

[skip ci]
chore(*): link to thumbnails feature doc page

[skip ci]
feat: customize form

[skip ci]
feat($Boilerplate): Add success and error pages

These pages are what the boilerplate generate will redirect you to
on error or succes.

[ci skip]
feat(customize.html): Email field is required
feat($customize): Add more builds

* UI mode
* Paste
* Dnd
* Delete File
* Edit File
* Image Previews

[ci skip]
feat($build/error.html): Show error message based on query string
feat($customize.html): Implement UI tweaks
Merge branch 'site/customize' into feature/4.0-site-update
fix(customize.html): Use correct URL for builder

http://fu-assembler.elasticbeanstalk.com/build
fix($customize): Proper url is in place
chore(*): prepare for 4.0.0 release

[skip ci]