Added Random Header Images

-Added folder for header images in /images
-Added random image functionality to header
-Fixed subsequent minor style display issue in custom.less
Fixed typo in the reference page
The filter function accepts 3 arguments, so the second 4th argument to
add_filter should be 3
Whitespace normalization
The user only receives points for the first two posts of the day
reference #8
Fixed bug where the user id was being passed in as the points value
Merge remote-tracking branch 'origin/point-restriction' into dev