Adjusted word breaking rules in editor
Adjusted word breaking rules in editor

Fixes #427
- Removed break-all, which was causing excessive behaviour detailed in the issue
- Removed -webkit- hyphen prefix, as both Chrome and Safari are ignoring it
- Firefox is currently the only browser respecting hyphens, the others simply break without hyphenating

airycanon/Ghost-Admin,dbalders/Ghost-Admin,TryGhost/Ghost-Admin,airycanon/Ghost-Admin,acburdine/Ghost-Admin,kevinansfield/Ghost-Admin,JohnONolan/Ghost-Admin,TryGhost/Ghost-Admin,acburdine/Ghost-Admin,dbalders/Ghost-Admin,kevinansfield/Ghost-Admin,JohnONolan/Ghost-Admin