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

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+
+[*.sh]
+indent_size = 4
+indent_style = tab

tools/install.sh

@@ -75,7 +75,6 @@ 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";
@@ -116,7 +115,7 @@ main() {
 	echo ''
 	echo 'p.s. Follow us at https://twitter.com/ohmyzsh.'
 	echo ''
-  echo 'p.p.s. Get stickers and t-shirts at https://shop.planetargon.com.'
+	echo 'p.p.s. Get stickers and t-shirts at http://shop.planetargon.com.'
 	echo ''
 	printf "${NORMAL}"
 	env zsh