dkpro#66 Add inflection group to word form

  - Added inflection group property to the word form interface

src/main/java/de/tudarmstadt/ukp/jwktl/api/IWiktionaryWordForm.java

@@ -86,6 +86,16 @@ public interface IWiktionaryWordForm {
 	/** Returns the {@link GrammaticalGender} of this word form or 
 	 *  <code>null</code> if no gender is specified or applicable. */
 	GrammaticalGender getGender();
+
+	/**
+	 * Returns the index of the inflection group this word form belong to.
+	 * Semantics of this property may differ from language to language.
+	 * Roughly speaking, inflection group corresponds to the column in
+	 * the inflection table.
+	 * @return Index of the inflection group, <code>-1<code> if there this word form
+	 * does not belong to an inflection group.
+	 */
+	int getInflectionGroup();
 
 	/** Returns the {@link GrammaticalPerson} of this word form or 
 	 *  <code>null</code> if no person is specified or applicable. */

src/main/java/de/tudarmstadt/ukp/jwktl/api/entry/WiktionaryWordForm.java

@@ -42,6 +42,7 @@ public class WiktionaryWordForm implements IWiktionaryWordForm {
 	protected GrammaticalNumber grammaticalNumber;
 	protected GrammaticalCase grammaticalCase;
 	protected GrammaticalGender grammaticalGender;
+	protected int inflectionGroup = -1;
 	protected GrammaticalPerson grammaticalPerson;
 	protected GrammaticalTense grammaticalTense;
 	protected GrammaticalMood grammaticalMood;
@@ -93,6 +94,18 @@ public void setGender(final GrammaticalGender grammaticalGender) {
 		this.grammaticalGender = grammaticalGender;
 	}
 
+	@Override
+	public int getInflectionGroup() {
+		return this.inflectionGroup;
+	}
+
+	/** Assigns the given inflection group to this word form.
+	 * @param inflectionGroup index of the inflection group.
+	 */
+	public void setInflectionGroup(int inflectionGroup) {
+		this.inflectionGroup = inflectionGroup;
+	}
+
 	public GrammaticalPerson getPerson() {
 		return grammaticalPerson;
 	}