Add -j4 to MAKEFLAGS

All of the computers I use have at least 4 processor cores. Telling make
to use four jobs makes sense as a default for me. It may not make sense
for everyone.
Replace calls to tmux aliases with proper name

tmux aliases "unbind" to "unbind-key" and "bind" to "bind-key". This
removes calls to the aliases and replaces them with calls to the more
explicit name.
Force tmux to use the current path when opening a window

In a recent version of tmux the default behavior changed for opening
windows and panes. When opening a window or pane in tmux it now uses
the current path of the environment tmux was opened in. It used top open
it to the current path of the currently selected window or pane. This
commit restores the behavior of opening a new window or pane using the
current path of the current tmux pane or window you are in.
Use better go package for vim

"jnwiteh/vim-golang "only provides very basic features of go in vim.
"fatih/vim-go" turns vim into a go IDE, which I happen to like better.
Add vim syntax file for ragel