Added navigation bar appearance
Added navigation bar appearance

Closes #203

joerocca/GitHawk,rnystrom/GitHawk,rnystrom/GitHawk,rnystrom/GitHawk,joerocca/GitHawk,joerocca/GitHawk,joerocca/GitHawk,joerocca/GitHawk,joerocca/GitHawk,rnystrom/GitHawk,rnystrom/GitHawk