improve vendors install

- make vendor update -u work also for scratch setups
- checkout AdminLTE if it is not present (even in -u mode)
Merge pull request #24 from glensc/blank-update

improve vendors install
Changed the fetch vendor command in order to use bower for theme installation with secific version
file path fix
another typo -.-
pointing some stylesheets to adminlte variants
Merge branch 'master' into develop