Revert gitignore package-lock, fix #115

Remove package-lock.json from gitignore for npm
Fix bug in #115 that modified user's gitconfig when running tests

Author: 4U6U57

.gitignore

@@ -1,4 +1,3 @@
 node_modules/
 sandboxrepo
 git-open.1
-package-lock.json

test/git-open.bats

@@ -40,7 +40,7 @@ setup() {
 ##
 
 @test "url: insteadOf handling" {
-	git config --global url.http://example.com/.insteadOf ex:
+	git config --local url.http://example.com/.insteadOf ex:
 	git remote set-url origin ex:example.git
 	git checkout -B master
 	run ../git-open