Move com.xemantic.ankh package into separate library called ankh

[morisil]

There is already lots of shared code in both, github-users and github-users-web, which can be moved to separate library. It should be multimodule project and these modules have been identified so far:

• ankh-shared
• ankh-test (maybe ankh-shared-test)
• ankh-web

(might be more)

Test for Page.emitPagesOn method should be provided.