Do not exit install.sh on errors (revert part of 0787a559). Fixes #853.
diff --git a/install.sh b/install.sh
index 35a13e6..3dc4b84 100755
--- a/install.sh
+++ b/install.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-set -e
-
 { # this ensures the entire script is downloaded #
 
 nvm_has() {