Add angular.piwik 1.0.2

This commit adds the angular-piwik library with the name angular.piwik
(to match the naming convention for the angular library for which it is
an addon).

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
Merge pull request #2235 from kevinoid/angular.piwik

Add angular.piwik 1.0.2