Memoizer: Implement LongToIntMemoizer, IntToIntMemoizer
Ranker/Reranker: Split into GridReranker, GridFeatureVector; rename Ranker to GridRanker to avoid name clash with package learning
*: Update copyright notices to 2014, add missing ones
Add format_coord to GridCell as with GridDoc
FeatureVector: First implementation of label-attached features (for classifier)
Classify/FeatureVector: Allow for label-attached features, redo FeatureVector factories
*:Get rid of trailing spaces
UserFrequency: Need to cast to long before shifting, even if right operand is long
FeatureVector/Ranker: Merge unigram/ngram features
ParseTweets: Preserve deletion messages and keep in order
NewClassify: Separate out ranker/classify command-line params
Ranker: Add classifier as possible ranker (NOT FINISHED)