initial commit
adds constants
adds units
adds basic implementation for path and distance
adds kilometers and miles unit support for distance
rearranges and comments. adds new utils subdir
adds for loop in dist calc over _.reduce for clarity
adds link to calculation base. comment only.
adds comments
adds area path mixins
removes utils dir. everything in lib root.
adds comments to clear area calc iteration
adds support for sqmiles and acres area calcs
adds center calc