Fix Typos

gitlab-development-kit/.editorconfig:57:58: "precendence" is a misspelling of "precedence"
gitlab-development-kit/Vagrantfile:136:68: "seperately" is a misspelling of "separately"
gitlab-development-kit/Vagrantfile:138:64: "seperately" is a misspelling of "separately"
gitlab-development-kit/doc/howto/auto_devops.md:511:55: "peristent" is a misspelling of "persistent"
gitlab-development-kit/doc/howto/saml.md:78:55: "documenation" is a misspelling of "documentation"
gitlab-development-kit/doc/howto/troubleshooting.md:32:12: "occured" is a misspelling of "occurred"
gitlab-development-kit/doc/howto/unicorn.md:3:16: "prefered" is a misspelling of "preferred"
gitlab-development-kit/grafana/grafana.ini.example:120:49: "seperated" is a misspelling of "separated"
gitlab-development-kit/lib/git/configure.rb:21:27: "seperate" is a misspelling of "separate"
gitlab-development-kit/spec/lib/gdk/config_settings_spec.rb:33:19: "arrary" is a misspelling of "array"
gitlab-development-kit/vagrant/Dockerfile:6:62: "compability" is a misspelling of "compatibility"