Merge pull request #30 from iliv/master

Updates documentation
Not sure wtf happened but someone changed pg_conf* to postgresql_conf* I have fixed it in the source.
Merge branch 'master' of github.com:commandprompt/PITRTools
Added failover conf directory
Moved conf directories under /etc where they more likely belong
worked around import from error
Corrects typos and updates documentation to reflect changes to etc/ structure