ripple init: added context to error to show found ripple.config path.

Trying to add context to an error so users can find the ripple.config that is controlling their destiny.

## Cavet ##

I updated the test I broke with this change but on my system I had 2 tests fail in teardown related to file/directory cleanup. Did a  ```git clean -dfx``` and then only one test failed. rake-d again and no tests failed. The failure is in DeleteDirectory which is a FubuCore thing. Is this a known problem?

```
Tests run: 326, Errors: 2, Failures: 0, Inconclusive: 0, Time: 8.636494 seconds
  Not run: 0, Invalid: 0, Ignored: 0, Skipped: 0

Errors and Failures:
1) TearDown Error : ripple.Testing.from_a_solution_dir.finds_the_code_dir
   TearDown : System.IO.IOException : The directory is not empty.

--TearDown
   at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound)
   at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
   at FubuCore.FileSystem.DeleteDirectory(String directory) in c:\BuildAgent\work\4dafc5966c0aefb4\src\FubuCore\FileSystem.cs:line 145
   at ripple.Testing.from_a_solution_dir.TearDown() in c:\projects\ripple\src\ripple.Testing\RippleFileSystemTester.cs:line 37

2) TearDown Error : ripple.Testing.Model.SolutionFilesTester.reads_the_projects
   TearDown : System.IO.IOException : The directory is not empty.

--TearDown
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound)
   at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost)
   at FubuCore.FileSystem.DeleteDirectory(String directory) in c:\BuildAgent\work\4dafc5966c0aefb4\src\FubuCore\FileSystem.cs:line 145
   at ripple.Testing.Model.SolutionFilesTester.TearDown() in c:\projects\ripple\src\ripple.Testing\Model\SolutionFilesTester.cs:line 45
```