Fix false positive error regexp matches

that can fail compilation-auto-jump.
Bump version to 0.6.5
A few minor fixes

1. Quote path in ggtags-find-tag
2. Do not close the window if exit abnormally
3. Tweak ggtags-global-mode-font-lock-keywords
Fix #7: New command ggtags-list-tags
Fix incorrect value of variable ggtags-root-directory

in ggtags-ensure-root-directory. Quote file name in ggtags-list-tags.
New command ggtags-delete-tag-files