duojs/duo — pull request #251 by hemanth (2014-08-25 10:37:46+00:00)
Title: Better error handling for missing files and extensions.

Better error handling in case of file being present and not having the required extension.

With this path, the flow would look like:

```sh
$ duo test

error : No such file : kl
```

```sh
$ cat > test
//Some JS
```
```sh
$ duo test

building : test
error : Error: test has no extension, only .js and .css are supported.
```