update indices of naming file
failing testcase for NameError and Timeout
convert naming provider to use a pstore

The existing method of using flat text files meant that indices had to
be manually updated. This was causing terribleness in the form of nil
references and infinite loops.

A rake task was added to use the text files to generate a binary
pstore indexed by letter name. This is more efficient since it is
thunked more quickly into memory and names are reached in constant time

fixes #28
Merge branch 'naming-bugs'
v0.0.21