In the past the installer would modify the user's ~/.bashrc and thus needed to
find the current user's name and home directory. However, the installer no
longer modifies user's ~/.bashrc and getent also outputs error messages for
Cygwin users.

Documentation and install scripts now instruct older Python users to upgrade
their Python version or install older versions of autojump.

'install.sh' now gets a -f|--force option, which makes the install ignore
Python dependency requirements.

2.6.

This was caused by the rewrite to use argparse over optparse to handle command
line arguments.

This should solve
http://github.com/joelthelion/autojump/issues/#issue/34

were incorrect. Removed those comments.

install.sh:
1. for those who have a /etc/profile.d
   then grep .bashrc for the sourcing of the autocomplete code
2. for those who use OSX
   grep .bash_profile to make sure .bashrc is sourced.

in order for newline characters to be parsed correctly