Various additions and optimizations. Add BASH_PROMPT_AWESOME and MARKS.

Add more docs for passgen. Add vimgrep, urlencode, urldecode, serialize, and
unserialize bash aliases. Add BASH_PROMPT_AWESOME which shows a random emoji in
the prompt. Add Jeroen Janssens' marks for quickly navigating the fs. Point @ps
vim shortcut to read custom coding standard in ~/.phpcs.xml. Point @c vim
shortcut to ignore unnecessary errors, imo.