Okapi root build file's url setting is incorrect

[John O'Conner]

The okapi root pom file references an outdated URL for the project:

<artifactId>build-okapi-root</artifactId>
<packaging>pom</packaging>
<name>Okapi Build Root</name>
<url>http://code.google.com/p/okapi</url>

The url should be this:

<url>https://bitbucket.org/okapiframework/okapi</url>

[Chase Tingley]

John has submitted a fix in Pull request #16