fixing a typo or two
Merge pull request #4 from ke4qqq/patch-1

fixing a typo or two in readme.md
Merge branch 'prepare_pull', remote-tracking branch 'bodepd/master' into prepare_pull
Sort security_group
included some changes from bodepd/dev branch
included some changes from bodepd/dev branch
included some changes from bodepd/dev branch
rename key_name parameter to key_pair