Remove restrictions on directory for scm-breeze

Previously the script had to be installed to ~/.scm_breeze. Now it can
live anywhere!

install.sh

@@ -1,6 +1,9 @@
 #!/bin/bash
+
+#locate the dir where this script is stored
+scmbDir="$(dirname "$0")"
 # This loads SCM Breeze into the shell session.
-exec_string='[[ -s "$HOME/.scm_breeze/scm_breeze.sh" ]] && . "$HOME/.scm_breeze/scm_breeze.sh"'
+exec_string='[[ -s "$scmbDir/scm_breeze.sh" ]] && . "$scmbDir/scm_breeze.sh"'
 
 # Add line to bashrc and zshrc if not already present.
 for rc in bashrc zshrc; do
@@ -11,7 +14,7 @@ for rc in bashrc zshrc; do
 done
 
 # Load SCM Breeze update scripts
-. "$HOME/.scm_breeze/lib/scm_breeze.sh"
+. "$scmbDir/lib/scm_breeze.sh"
 # Create '~/.*.scmbrc' files from example files
 _create_or_patch_scmbrc