removed comment about primary constructor parenthesis.
Fixed broken link
Fix broken link
Merge pull request #44 from NataliaUkhorskaya/master

Fix broken link
Update extensions.md

Fixed minor typo.
Merge pull request #45 from dittert/patch-1

Update extensions.md
Added examples for array interoperability with Java.

A little more explanation about arrays with primitive types. Also some
minor other changes.
Added info on bug reporting
Merge pull request #46 from dittert/ddt-array-interop

Added examples for array interoperability with Java.
Dangling markup 

(and on-site clicking doesn't work here).
Fix markup bug