replaced fatalExit function for 'inline' exit
exit on errors (set -e)
simplified if for NVM_DIR and NVM_SOURCE, corrected indentation
don't make use of pushd and popd as they are not universal
made NVM_DIR and NVM_SOURCE configurable using environment variables
replaced undocumented option for specifying the profile as first argument to specifying it as a environment variable (eg: PROFILE=~/.myprofile ./install-gitless.sh)
also; fixed indentation and added .zshrc as possible profile
Updated source string, use hard path as NVM is not always installed in `$HOME/.nvm`
updated output without special characters (tab; \t)
Omit duplicate 'finish line'
normalized indentation
updated README
use comparison opts
git, curl and wget now all in one installer
Display error when unable to update
fix
Force install method by setting METHOD=git/script
Prevent fallback
Emulate curl with wget
Merge pull request #371 from koenpunt/single-installer

Merged installer and gitless installer into one