Updated the UserDocumentation to include Gentoo build instructions.
Merge branch 'master' of https://github.com/baumgarr/Nixnote2
Made a few more fixes to the user documentation.

Removed some double words and added a few spaces where they should be.
Generated a new .pdf file.
Merge pull request #26 from Maffblaster/master

Changes to UserDocumenation to include instructions to build NN2 on Gentoo.