Moved data Structures to Index file, made Index a singleton

Also added the data we'll be needing to do tests. Finished writing a
reader for the Names file. (Made me create a new WordID tree, which know
to show words by ID, so we can use it to differ Tweets in run time.)
Added an implentation of a Sorted Set

Added that implementation, 3 more functions need to be implemented.

Added a names by id tree for usage of getting the names of the social
network members and so we'll have a reader for that list.

Will finish the readers next time around (I hope)