0.9 dev

2cd12c27c1d44f982eac3952605df80d78b03883: The hardcoded `class="btn"` isn't needed, but breaks the option to add your own class. 

9ed49ab97778cecfb5df37a94b4d2a260d671ccc: This is an improved `slugify` function. Some examples:
```
Test: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor.
 Old: lorem-ipsum-dolor-sit-amet-consectetuer-adipiscing-elit-aenean-commodo-ligula-eget-dolor
 New: lorem-ipsum-dolor-sit-amet-consectetuer-adipiscing-elit-aenean-commodo-ligula-eget-dolor
   
Test: Weit hinten, hinter den Wortbergen, fern der Länder Vokalien und Konsonantien leben die Blindtexte. Abgeschieden wohnen Sie in Buchstabhausen an der Küste des Semantik, eines großen Sprachozeans.
 Old: weit-hinten-hinter-den-wortbergen-fern-der-lander-vokalien-und-konsonantien-leben-die-blindtexte-abgeschieden-wohnen-sie-in-buchstabhausen-an-der-kuste-des-semantik-eines-groen-sprachozeans
 New: weit-hinten-hinter-den-wortbergen-fern-der-laender-vokalien-und-konsonantien-leben-die-blindtexte-abgeschieden-wohnen-sie-in-buchstabhausen-an-der-kueste-des-semantik-eines-grossen-sprachozeans
   
Test: Skromny młodzieniec bo tak piękny i książki.
 Old: skromny-modzieniec-bo-tak-pikny-i-ksiki
 New: skromny-mlodzieniec-bo-tak-piekny-i-ksiazki
   
Test: This--is-a-totally--weird-check!!!-believe-me-i'm-lying
 Old: this-is-a-totally-weird-check-believe-me-im-lying
 New: this-is-a-totally-weird-check-believe-me-i-m-lying
   
Test: Кюм эа ныморэ факэтэ, диам чингюльищ дуо нэ.
 Old: -
 New: kyum-ea-nymore-fakete-diam-chingyul-ish-duo-ne
   
Test: Υσυ εσε δοσθυς ιν. Δετρασθο αντιωπαμ πρι συ, ομνις αυτεμ μαλυισετ ατ κυι.
 Old: -
 New: ysy-ese-dos8ys-in-detras8o-antiwpam-pri-sy-omnis-aytem-malyiset-at-kyi
   
Test: Déi wellen Fielse um, Fläiß d'Loft rëm jo.
 Old: dei-wellen-fielse-um-flai-dloft-rem-jo
 New: dei-wellen-fielse-um-flaeiss-d-loft-rem-jo
```

5f1b7dbd6935f3dde2c7990d9567c62780f632e5: This optimized the generation of slugs.

691d33eda0ede4e70cbfd723cd8c0cd1ed813114 and 4b7531fa5e5c4fb59d79a80baff00feaf453a945: I think (and hope) I updated all labels, so you can actually click on them. :)