S-MatchWeb

This update covers the s-match-web module of s-match. It provides a GWT based client for performing s-match between two data trees and shows the relationships between tree nodes.

Specifically, this update:
1. removes the files changed by github gui and intellij in formatting and file mode change(http://stackoverflow.com/questions/1580596/how-do-i-make-git-ignore-file-mode-chmod-changes).
2. removes an extra widget for the s-match-web main UI and incorporates the GUI in the entry point class.