Allows gallery-item to scale to the size of the content

First sets gallery-item height equal to the main img height.
If browser is resize, the height is reset. When more btn is
clicked, the gallery-item will expand or shrink in height
to match the height of the content it contains. The content
will then slide in. When the btn is clicked again, the content
slides out and gallery-item will resize to the main img height.
fixes min-width 767px media query

The layout got messed up when I added the .cssanimations class
in front of my animation styles because they were overriding
the media query styles. I had to select for both the original
classes and .cssanimations .original-classes to get it to work.
edits logo copy in gravity section
Fixes issues with auto height expand

Removes document resize jquery that set gallery item height.
Removes css animation on gallery item height. Uses jquery to
animate height to gallery content height.
When more is clicked agian, animtion is reversed and css
on gallery img and content is reset.
transition slideLeft.
adds more padding to .content and max-width to p-wrap

Adds 130px of padding to bottom of .content so the
more btn doesn't overlap it anymore. Sets a max-width
of 900px on .p-wrap so it doesn't stretch full screen.
Makes easier to read on large displays.
removes duplicate/unnecesary styles on ani .content
adds ie style
changes intro colors to non rgba and removes neg bottom margin
updates added heighton gallContHeight to account for new padding
decreases .p-wrap max-width to 650px to match other pages
sets av.png as fall back for svg logo
adjusts first-thumbs margin-top
changes more btn from badge to text banner
adjusts bg color and box shadow on more btn
adjusts background-color on more btn
merges -expandHeight branch into master