Adds diodes to protect charging sources from reverse current

git-svn-id: https://heledd.googlecode.com/svn/trunk@88 76c5b99b-c41f-f9d4-998d-396bb8324e16
Splits board preview into top/bottom for clarity, updates BoM

git-svn-id: https://heledd.googlecode.com/svn/trunk@89 76c5b99b-c41f-f9d4-998d-396bb8324e16
Pretties up the schematic and adds a pdf preview

git-svn-id: https://heledd.googlecode.com/svn/trunk@90 76c5b99b-c41f-f9d4-998d-396bb8324e16