update global colors
add lightGreen
update @red to match semantic-ui asthetics
first pass variable substitution for headers

add legend
swap color vars with globals
remove deprecated browser prefixes on box-shadow and border-radius
make size variables usable
update global.variables.
positive and negative now default to @red and @green
update header.less to use current @green color
Merge pull request #301 from anotherZero/css

header.less color variables