fixing issue #171

Fixes situation when HOME=/root and /any/other/dir/root
will be replaced with /any/other/dir~
Fixed issue #162. Added programm exit value check to _lp_bzr_branch_color to return in case the current directory is not a Bazaar directory.
Local IFS reset to our expected standard value

Revert 289782f35058 (broken patch from issue #133) and really fix #132.
Restore LP_ERR as the first instruction of _lp_set_prompt
Merge branch 'devel' of http://github.com/Cougar/liquidprompt into develop

Conflicts:
	liquidprompt
Merge branch 'fix/_lp_bzr_color' of http://github.com/mainerror/liquidprompt into develop
Merge branch 'fix/IFS' of http://github.com/dolmen/liquidprompt into develop
doc #153: instructions for setting up with zsh