Minor editorial correction in User's Guide
Merge remote-tracking branch 'klub/master'
AdvPreferredLifetime parameter in radvd.conf added
Added Doc on FlexLexer.h issue on Mac OS X
Changed my mind on the location of the doc.
Merge pull request #7 from thorsager/FlexLexer-header-file

FlexLexer.h documentation
Merge branch 'master' into auth