Use sheerun/vim-polyglot vim-polyglot [fixes #512]

* Delete duplicated plugins

Same plugin source included with vim-polyglot
 "tpope/vim-haml"
 "kchmck/vim-coffee-script"
 "groenewege/vim-less.git"
 "digitaltoad/vim-jade.git"
 "rodjek/vim-puppet"
 "pangloss/vim-javascript"
 "briancollins/vim-jst"
 "vim-ruby/vim-ruby.git"

Different plugin source included with vim-polyglot
 "jtratner/vim-flavored-markdown.git" => tpope/vim-markdown

The functionality of this plugin is already included in othree/javascript-libraries-syntax.vim
"itspriddle/vim-jquery.git"