Better support for international characters

Thanks to tailbalance of reddit

http://www.reddit.com/r/emacs/comments/1khq86/magnarssel_github_string_manipulation/
Release 1.6.2
Fixes to docs

Fixes #40 #41 #42
s-split-words now also splits ABc into A Bc
new example for s-split-words
Merge pull request #43 from Bruce-Connor/master

s-split-words now also splits ABc into A Bc
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.