title: Error with cmake when trying to load yamlcpp
body: <p>I've tried to install Astron-master using cmake, however there seems to be a problem with cmake not recognizing yamlcpp when doing so. I was told that this is a cmake error and not yamlcpp, since I was able build yamlcpp successfully. cmake gives this error</p>
  
  <pre><code>Could NOT find YamlCpp (missing:  YAMLCPP_LIBRARY YAMLCPP_LIBRARY_DIR) 
  CMake Error at CMakeLists.txt:116 (message):
    You need yamlcpp to build this, build yamlcpp in the 'dependencies/'
    directory, or install it as a system package
  </code></pre>
  
  <p>I'm using <code>yaml-cpp-0.5.1</code> on windows 7</p>
  
  <p>I have images showing my folders and it helps get a better idea, but I am not allowed to upload until I have 10 rep.</p>