Add documentation for textpatternextractor
Tweetloaders: add remote stats extraction

+ Some refactoring.
Main: fix imports
Main-gold: use default extractors
Add __init__.py to tweetloaders
Fix indendation
Add some documentation
Add Tilman's preprocessing code

Does Tagging, Tokenization and Smiley detection
Add build script and move class files to subdir
Move data to subdir
Move libs to libs/