Fix bad parsing for some .gitmodules that path and url not ordered (#61)
Fix bad parsing for some .gitmodules that path and url not ordered (#61)

for example, the .gitmodules in https://git.zx2c4.com/cgit is like this:

```.gitmodules
[submodule "git"]
	url = https://git.kernel.org/pub/scm/git/git.git
	path = git
```
gogits/git-module