#46: Added callback tests.
#46: Added JW.AbstractArray.getLastKey. Structurized collection methods documentation.
#46: Added reference to methods list in collection class implementations.
#46: Added first sample to guides.
#46: Updated sample by TweetView instead of ProfileBox.
#46: Added second sample.
#46: Added sample 3.
#46: Added sample 4.
#46: Added sample 5.
#46: Finished guides development.
#46: Made f parameter optional in sorting methods.
#46: Convered array constructors by tests.
#46: Tested some methods in JW.AbstractArray, fixed bugs.
#46: Tested remaining methods in JW.AbstractArray, fixed bugs.
#46: Tested JW.Array static methods, fixed bugs.
#46: Tested JW.ObservableArray events.
#46: Added JW.AbstractArray.performFilter, detectFilter. Improved JW.AbstractArray.removeItems algorithm. Tested JW.AbstractMap and all adjacent stuff.
#46: Tested common collection methods for JW.AbstractSet and its adjacent stuff, fixed bugs.
#46: Tested simple set modification methods.
#46: Tested JW.AbstractSet remaining methods, fixed bugs.