title: "Invalid projection" when creating a CRS
body: <p>I am attempting to construct a CRS instance with PyProj to match a geographic shape to image bounds. With the following code</p>
  
  <pre><code>pyproj.Proj(proj='aea', lat1=b[1], lat2=b[3])
  </code></pre>
  
  <p>I am getting the error:</p>
  
  <pre><code>pyproj.exceptions.CRSError: Invalid projection: +proj=aea
   +lat1=34.82176739999999 +lat2=34.8219931 +type=crs
  </code></pre>
  
  <p>There doesn't seem to be a lot of documentation about what makes a projection valid or invalid, apart from an apparently <a href="http://trac.osgeo.org/proj/wiki/GenParms" rel="nofollow noreferrer">no longer extant documentation page</a> on the Proj4 wiki. Can anyone help me to understand what's going wrong here? The code (not written by me) appears to have worked in the past.</p>