Fix the dysfunction of install.sh in Ubuntu.

The command 'realpath' doesn't exist in Ubuntu, so use the commands cd
and pwd as alternatives.
Catch exceptions which is thrown when setting solarized colorscheme.
Create the aliases file to store all aliases for shell.

The files zshrc and bashrc should load this aliases file.
Modify wildmode in vimrc to be zsh-like.
Merge remote-tracking branch 'origin/master'
Catch the exceptions thrown when calling togglebg#map function.
Remove mappings about moving between windows.

Default key mapping ctrl-l to redraw window is useful.
Additionally, add nohlsearch function to ctrl-l key.