Uset .tmgit instead of .dotfiles as git dir

[elisboa]

The .dotfiles dir was used as a test and ended up being used until today. So, it would be better to use .tmgit instead of a generic name like .dotfiles.

However, we should check if there is a recommend way to migrate all existing data: if by moving the directory or if by using git init.

[elisboa]

Changed .dotfiles to .tmgit as base dir for git dir.

If you're updating this code on a current project, you must:

1. Before updating, disable tmgit.sh calls on crontab
2. Update tmgit.sh and functions.sh files
3. Go to your project directory (cd my_versioned_dir), then run:
   mv .dotfiles .tmgit
4. Reenable your cron OR run it manually first, but exactly as you put on your cron:
   eval $(crontab -l | grep -E -v '^#|push-remote' | grep /MY_VERSIONED_DIR | awk '{print $6}')

[elisboa]

Code merged into dev branch. Will try to solve issue #14 before update do master and then generate a 0.6 release