use sass by default, implement gulp to autoprefix, minify css and ugl…

[bilelmoussaoui]

• Use SASS instead of native CSS code (cleaner, easier to modify later)
• Few fixes and cleannig
• Use Gulp to autoprefix the css, minify the css & image, uglify js files, and few other stuff!
• Fix W3C HTML validations issues
• Add Feed.xml file (for RSS subscription)
• Use Travis to compile test if sass & js files have no issues

Shouldn't be merged yet! Not all the stuff are implemented

[bilelmoussaoui]

@gnunn1 I've merged this PR, this contains mostly some design improvements & code cleaning. It's now easier to modify the website in the future. Here's a small video that shows the before/after PR
https://youtu.be/X8Ups7E15Jo
There's just some few contents missing here https://gnunn1.github.io/tilix-web/manual/
I didn't know what to write...

[gnunn1]

Thanks, it looks great. I've gone ahead and updated the various manual titles to display appropriate text. Thanks for all your hard work on this, much appreciated!

[bilelmoussaoui]

it's the app i use every day for almost everything so :)
By the way, which application you've used to get this screenshot ? https://gnunn1.github.io/tilix-web/manual/quake/ I would like to update the others; in order to fix #21

[gnunn1]

I just use the gnome screenshot tool and press <alt><print screen>, nothing too complicated.

[gnunn1]

BTW I noticed in your video that you are underlining the title of the active terminal. I'm not sure if that's some custom CSS you are doing or something in the theme. However in case it is of interest, note that I've added support for the CSS active style for the .terminal-titlebar class so you can actually underline the whole titlebar if you wish.