fixed makeSnippets
fixed ndcg
Merge branch 'master' of https://github.com/easten20/InformationRetrieval

# By easten20
# Via easten20
* 'master' of https://github.com/easten20/InformationRetrieval:
  fix wikipages wikiPagesMatchingQuery
  fix from int to long
Merge branch 'master' of https://github.com/easten20/InformationRetrieval

# By easten20
# Via easten20
* 'master' of https://github.com/easten20/InformationRetrieval:
  fix wikipage gettitle trim result
Merge branch 'master' of https://github.com/easten20/InformationRetrieval

# By easten20
# Via easten20
* 'master' of https://github.com/easten20/InformationRetrieval:
  fix wikipage...
fixed ndcg