+ 'userprefs' and 'pidb' files added to '.gitignore'
+ 'Gizmos' and 'Plugins' directories (and their associated 'meta' files added to '.gitignore'.
- Assets/3rd_party/README.md now provides more explicit instructions for manual importing.
- Merge branch 'development'
* ".gitignore" no longer ignores Assets directory.
- Merge branch 'development'