Run the $SHELL with TERM=vt100 to avoid problems with zsh

Without setting the $TERM and in case $SHELL happens to be zsh the exec-path becomes the following when the script is run at init time from init.el:
("tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
tput" " No value for $TERM and no -T specified
/usr/local/bin" "/usr/local/sbin" "/bin" "/usr/sbin" "/sbin" "/usr/bin" "/usr/X11/bin" "/usr/local/mysql/bin" "/Users/rauhahe/bin" "/usr/local/share/npm/bin
")

The version with TERM=vt100 works fine with bash as well.

After init the original function works even with zsh, but at init time it needs the explicitly set TERM variable.
Merge pull request #171 from hvrauhal/patch-1

Run the $SHELL with TERM=vt100 to avoid problems with zsh