Fix lesspipe.sh detection in custom PATH

The detection of lesspipe.sh has to be done after setting PATH as it
could be installed in a non-standard bin directory. For example,
Homebrew installs lesspipe in /usr/local.
[Fix #383] Do not set $MANPATH

man dynamically searches for man pages based on $PATH.
[Fix #385] Do not set $INFOPATH
[Fix #381] Remove the path_helper workaround
Use $GNUPGHOME in GPG agent startup

Use the value of $GNUPGHOME, to facilitate moving GPG's home.

This lets users who keep their GPG keyring on external devices or alternate
folders use the gpg-agent autostarting, even if $HOME/.gnupg does not exist.
Add support for nvm
[Fix #351] Set empty keys to an invalid UTF-8 sequence
[Fix #398] Manually set locale
[Fix #396] Remove the osx trash function

The trash program found at http://hasseg.org/trash is a superior
implementation.
Add Emacs module

Enables Emacs dependency management with Carton.
Use the builtin $signals array
[Fix #399] Only enable the main syntax highlighter
Update external completions
Update external syntax-highlighting
Update external history-substring-search
Remove no longer necessary key bindings
Fix misspellings of the word bellow in READMEs
Wrap errant long line in git module README
Correct typos in git module README
[Fix #403] Display accented characters properly