Add new cppcheck formula.

Cppcheck - A tool for static C/C++ code analysis
http://sourceforge.net/apps/mediawiki/cppcheck/index.php?title=Main_Page

Doesn't have man pages yet, requires docbook files to generate them.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

* Add head
* Update to Homebrew style

Formula/cppcheck.rb

@@ -0,0 +1,17 @@
+require 'formula'
+
+class Cppcheck < Formula
+  url 'http://github.com/danmar/cppcheck/tarball/1.42'
+  homepage 'http://sourceforge.net/apps/mediawiki/cppcheck/index.php?title=Main_Page'
+  md5 'de8ffbd9d02c4ec01047ef7fd9f208cd'
+  head 'git://github.com/danmar/cppcheck.git'
+
+  def install
+    # Need to remove "-Wlogical-op" from c++ flags.
+    cxxflags = "-Wall -Wextra -pedantic -Wfloat-equal -Wcast-qual -O2 -DNDEBUG"
+
+    # Pass to make variables.
+    system "make", "BIN=#{bin}", "CXXFLAGS=#{cxxflags}", "install"
+    # Man pages aren't installed, they require docbook schemas which I don't know how to install.
+  end
+end