.bash_prompt: Add back escape sequences

Fixes #403.
Merge commit 'ceb19ea9a4f5afdbe2108ad53bf5d9ee6ed44ee7'

* commit 'ceb19ea9a4f5afdbe2108ad53bf5d9ee6ed44ee7':
  .bash_prompt: Add back escape sequences

Conflicts:
	.bash_prompt