[RFC] vim-patch:7.4.264

```
Problem:  Can't define a function starting with "g:". Can't assign a
          funcref to a buffer-local variable.
Solution: Skip "g:" at the start of a function name.
          Don't check for colons when assigning to a variable.
```

https://code.google.com/p/vim/source/detail?r=00acac0af680c2d8c82db5258474b121a5908926