Add .dotfiles/bin to PATH

After creating `dotfiles` repository, I store all custom executables in
.dotfiles/bin
Do not copy new line symbol, while copying line without linebreaks

If there's no linebreaks in the line, there's no reason to copy last
linebreak at the end of the line. So now I select not the whole line -
"V", but till the last symbol in the line - "vg_"
Change default wrapping width for markdown to 72 symbols

Before it was 80(almost cargo-culted). But really, after reading this
thread

    https://github.com/torvalds/linux/pull/17

I respect hardwrapping even more.

So, it could be

1) 78 symbols - as it said in RFC 2822 "Internet Message Format"

    http://www.ietf.org/rfc/rfc2822.txt

2) 72 symbols - as more "safe" version, which allows multiple quote
level(assuming all the lines are 78 symbols)

"
> Quote level 1
>> Quote level 2
Normal text
"

and compatible with commit messages recommendations from Tim Pope.
http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html

So I chose 72