Test with more Emacs versions on travis
Test with more Emacs versions on travis

ptrv/emacs-ycmd,phst/emacs-ycmd,emacsmirror/ycmd,phst/emacs-ycmd,phst/emacs-ycmd,ptrv/emacs-ycmd,abingham/emacs-ycmd,emacsmirror/ycmd,emacsmirror/ycmd,emacsmirror/ycmd,phst/emacs-ycmd,emacsmirror/ycmd,phst/emacs-ycmd,ptrv/emacs-ycmd,ptrv/emacs-ycmd,abingham/emacs-ycmd,emacsmirror/ycmd,abingham/emacs-ycmd,abingham/emacs-ycmd,abingham/emacs-ycmd,ptrv/emacs-ycmd,ptrv/emacs-ycmd,phst/emacs-ycmd,abingham/emacs-ycmd