Class renaming neccessary

[aortuondo002]

When using more than 1 ixa-pipes library, i.e, ixa-pipes-tok and ixa-pipes-pos, and instantiating the Annotate class it is annoying to have to write the full path to access each of these classes.

One way to solve this could be to make an API breaking change by renaming each of this classes in their respective ixa-pipes libraries and optionally these classes could implement a common interface.

[ragerri]

I will do something about it. Thanks!