v0.2.0: combine pluralization and singularization rules (#30)

* combine pluralization and singularization rules

Combines the rules for pluralization and singularization into a single
set for improved consistency and maintenance.
Suffix rules are now ordered with most specific matches (longest suffixes)
matched before shorter suffixes.

Also fixed pluralization of "you", should be "you" instead of "yous".
And added some extra cases for better handling of some words ending with
"us".

* remove unused rule

The rule for "appendix" suffix is not used because it's already
in the list of full words.

* alphabetize single to plural word map

v0.1.7: Words ending in ouse (#28)

* fix rule for words ending in ouse

The rule seems to have been entered backwards.
And it can be generalized to use->uses.

* remove incorrect and redundant rule

v0.1.6

Bump version & remove Travis

v0.1.0

Remove envy dep (#17)

Fixes #16