* add .gitconfig to set default for git

 * add .gitconfig to set default for git
  * refer: http://blog.asial.co.jp/845
 * remove default settings from .bashrc they already exist in the original .bashrc
 * fix LESS variable
  * git log command uses escape sequences
  * original LESS variable of less which was forked by git log is LESS=FRSX
 * add __git_ps1 to shell prompt
  * original PS1 is '${debian_chroot:+($debian_chroot)}\u@\h:\w\$'
  * refer: http://d.hatena.ne.jp/deeeki/20110402/git_branch_ps1

git-svn-id: https://lab.mitty.jp/svn/lab/trunk@156 7d2118f6-f56c-43e7-95a2-4bb3031d96e7