created tag model
added tag association
added post model
created spec_helper file
added testing requirements
rake db:test:prepare
realized that tags have many posts
testing name association
testing color association
tag must have a name
validates uniqueness of tag
validates presence of color
validate uniqueness of color
added length validation for tag color
added validation for color containing the initial # for a hex color designation
starting post tests
validate presence of title on post
validate presence of date_written
validates presence of preview on post
validate presence of tag