tmux: update config

* remove reattach-to-user-namespace
* remove unused key-bindings
* added several key-bindings
* added key-bindings for each window
* replaced user with host on status-left
* polished theme
* set xterm-keys
* control nested sessions
zsh: clean-up aliases
vim: replace neocomplcache with YouCompleteMe
vim: fix yankring file location
vim: remove most ruby specific plugins
vim: add latex-suite, graphviz
Revert "tmux: update config"

This reverts commit 3223a4fbc9ba3b854cabe8475107a31c3df868e7.
tmux: update config, move most to .user