segment/lan_ip: Fix for systems with multiple ips.

- Old version returned a list of 3 IPs, breaking the layout
- New version grabs the last IP, which appears to be the correct one
  that we want displayed, at least on this system.
- Also properly quoted variables and process substitution.
Clarify debug in README.
Merge branch 'acook/amc/multiple_lan_ip_fix'.
One quoting too much tho.
Add support for mailcheck to mailcount.sh
Merge pull request #161 from ryanakca/master

Add support for mailcheck to mailcount.sh
Update README with link to resolved issues.
Allow setting path or binary name of GNU grep

GNU grep isn't known as 'grep' on all systems. For example, on OpenBSD, it's
known as 'ggrep'. Allow customizing accordingly.
Merge pull request #163 from ryanakca/master

Allow setting grep binary name/path
Weather segment grep fix for BSD.
Merge pull request #164 from hadret/master

Fix grep in weather segment for FreeBSD
Added deprecation warning. Fixes #128
Some Macs don't  reach the max battery capacity

Checking ioreg for "FullyCharged" to be set to "Yes" and that's it's
connected to power; if so don't display segment. Also dropped the max
percentage to 99% (some older machines don't reach 100% charge
capacity).
Merge pull request #165 from ericboehs/master

Some Macs don't reach their max battery capacity
Merge remote-tracking branch 'erikw/master'