Hoe not found (documentation)

[fulldecent]

I cloned the repository and ran rake from the main directory. This produced the following error:

Williams-iMac:rake williamentriken$ rake
rake aborted!
LoadError: cannot load such file -- hoe
/Users/williamentriken/Developer/rake/Rakefile:18:in `<top (required)>'
(See full trace by running task with --trace)
Williams-iMac:rake williamentriken$

There was no mention of this in CONTRIBUTING. Also, "hoe" appears to be a generic word, so searching for the error is difficult on Google.

Using Mac OSX 10.11.1 (15B30a), and rake version 10.4.2.

[hsbt]

Thanks your report.

@pvdb fixed at #78