1. Create a git repository under currunt direcotry, then push this repository to dropbox.
1. Fix two bug that will arise when load 'scb.el' in a new envrioment:
   1. path of the file "tree.el" can't be found
   2. ctl-q-map is a void variable
1. Add provide and require utils, do not use file name anymore
2. Fix a bug: when find a file, the file can't be opened after selected.
Merge https://github.com/astropeak/silly-code-browser