add maintain repository section
excluding node_modules subdirectories jshint
Merge pull request #477 from serkanyersen/patch-1

add maintain repository section
#477 update a few words and add link for GitHub help
Merge pull request #480 from willguitaradmfar/master

excluding node_modules subdirectories jshint
Merge branch 'master' of https://github.com/linnovate/mean
Added sigunup functionality basic version