[postgis-devel] [PostGIS] #1720: Update extensions/README

[PostGIS]

#1720: Update extensions/README
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 Reporter:  mwtoews        |       Owner:  robe         
     Type:  patch          |      Status:  new          
 Priority:  medium         |   Milestone:  PostGIS 2.0.0
Component:  documentation  |     Version:  trunk        
 Keywords:                 |  
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 Summary of changes included in the patch:
  * reStructuredText Markup, 80 column text
  * Rewrite several paragraphs
  * Add requirements section
  * Make it clear that `--with-raster` is required, and that `postgis` also
 includes the raster support

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1720>
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