Add `s-word-initials
Merge pull request #44 from thisirs/master

Add `s-word-initials'
Release 1.7.0
Update README
Letters can be neither upper or lower case. Handle it.
Add s-presence.
Merge pull request #45 from rejeep/s-presence

Add s-presence.
Add s-present?
Remove double negation.
Merge pull request #46 from rejeep/s-present

S present
Release 1.8.0
Move s-presence into the misc bucket