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1. install postgis

   $ brew install postgis

2. start PostgreSQL service

   $ brew services start postgres

   stop PostgreSQL service

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// tansition
=transition($transition)
  -webkit-transition: $transition // chrome 25-
  transition: $transition

// transform
=transform($transform)
  -webkit-transform: $transform
  transform: $transform

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// group
=group
  &:after
    content: ""
    display: table
    clear: both

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// media query break point
// if 1em == 16px then 40em == 640px

=media($point)
  @if $point == "mobile"
    @media (max-width: 40em)
      @content
  @else if $point == "mobile2x"
    @media (-webkit-min-device-pixel-ratio: 2), (min-device-pixel-ratio: 2), (min-resolution: 2dppx)
      @content

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/*
 * FLEX MIXINS
 *
 * NOTE: ! for reason to adapt the prefix 
 *
 *
 * Old Syntax / 2009 Syntax / Box Syntax / WD
 * http://www.w3.org/TR/2009/WD-css3-flexbox-20090723/
 *
 *   -webkit

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/* Functions */

/*
 * $c1 == $c2
 */
@function isSameColor($c1, $c2)
  @return red($c1) == red($c2) and green($c1) == green($c2) and blue($c1) == blue($c2)

/*
 * Get Middle Color