Merge branch 'cr/tag'

* cr/tag:
  Teach "git stripspace" the --strip-comments option
  Make verify-tag a builtin.
  builtin-tag.c: Fix two memory leaks and minor notation changes.
  launch_editor(): Heed GIT_EDITOR and core.editor settings
  Make git tag a builtin.

environment.c

@@ -33,6 +33,7 @@ size_t delta_base_cache_limit = 16 * 1024 * 1024;
 char *pager_program;
 int pager_in_use;
 int pager_use_color = 1;
+char *editor_program;
 int auto_crlf = 0;	/* 1: both ways, -1: only when adding git objects */
 
 /* This is set by setup_git_dir_gently() and/or git_default_config() */