changed hover for hyperlinks

only overlay if in nav container
overlay on hover

includes CSS3 filter
took out read more
changed margin between images

took out extra code
fixed positioning of overlay

photo class has position relative,
overlay has position absolute

overlay will be positioned absolute within the photo class
trying to make images wrap responsively
restructured "places been" for photo grid

also cropped yosemite photo
made photo grid responsive

images will now wrap in rows and take up full container
edited photo grid for places eaten
fixed background image

no whitespace in browser window now
Merge branch 'wrap-img' into develop
updated "things made" for photo grid
made learn more container fit child contents

also changed filter for hover to grayscale