installer: use tabs to allow future heredocs

This will allow us to use tab stripping heredocs with `<<-'.
See http://www.tldp.org/LDP/abs/html/here-docs.html#EX71A

Add editorconfig file to enforce this style.
See http://editorconfig.org for more information.

.editorconfig

+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+
+[*.sh]
+indent_size = 4
+indent_style = tab

tools/install.sh

@@ -12,6 +12,7 @@ main() {
 	if command_exists tput; then
 		ncolors=$(tput colors)
 	fi
+
 	if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
 		RED="$(tput setaf 1)"
 		GREEN="$(tput setaf 2)"
@@ -68,7 +69,6 @@ main() {
 		exit 1
 	}
 
-
 	printf "${BLUE}Looking for an existing zsh config...${NORMAL}\n"
 	if [ -f ~/.zshrc ] || [ -h ~/.zshrc ]; then
 		printf "${YELLOW}Found ~/.zshrc.${NORMAL} ${GREEN}Backing up to ~/.zshrc.pre-oh-my-zsh${NORMAL}\n";
@@ -76,10 +76,10 @@ main() {
 	fi
 
 	printf "${BLUE}Using the Oh My Zsh template file and adding it to ~/.zshrc${NORMAL}\n"
-  cp "$ZSH"/templates/zshrc.zsh-template ~/.zshrc
+	cp "$ZSH/templates/zshrc.zsh-template" ~/.zshrc
 	sed "/^export ZSH=/ c\\
-  export ZSH=\"$ZSH\"
-  " ~/.zshrc > ~/.zshrc-omztemp
+export ZSH=\"$ZSH\"
+" ~/.zshrc > ~/.zshrc-omztemp
 	mv -f ~/.zshrc-omztemp ~/.zshrc
 
 	# If this user's login shell is not already "zsh", attempt to switch.