Merge pull request #71 from dongyemeng/master

Merge lastest
Updated gitignore.
Added Maven POM, added all jar dependencies, and moved source files into Maven structure.
Removed 'test' scope from junit dependency, since it is used in a regular source file. That should be moved however.
Added WordNet download to POM.
Modified method for calling ant from maven.
Merge pull request #72 from dongyemeng/master

Merge latest
Merged in new code from Dongye.
Merge pull request #73 from phenoscape/mavenize

Converted project to Maven build.
Merge pull request #21 from phenoscape/master

Convert project to Maven build.
Added class CommaAsAndAnnotator for CommaAsAndAnnotation module
moved code to CommaAsAndAnnotator class.