Added CalDAV and CardDAV instructions for BlackBerry OS 10
Use tabs for indention to get a code block
Removed 'http://' from CalDAV instructions
Use 'Select ...' step as used for iOS instructions
Added note to use basic authentication for BlackBerry OS10
Use list for important notes
Merge pull request #138 from janpieper/blackberry-os10

Instructions to setup CalDAV/CardDAV on BlackBerry OS10 devices