Documentation Conversion

Hello,

I have converted the current docbooks documentation to MardDown that
may now be placed in the github www repository. In this way the Jekyll
build of the web site will also automatically build the current state
of the docs. When a release occurs all that will be needed is to archive
the current state and add a link to the listed archives documentation.md
file.

An updated website documentations page along with newly created docs from
head may be reviewed and commented on at:

http://dandymadeproductions.com/temp/pgjdbc/documentation/documentation.html

danap.