Add plan for tree

Signed-off-by: kmacgugan <kmacgugan@chef.io>

tree/plan.sh

@@ -0,0 +1,21 @@
+pkg_name=tree
+pkg_origin=core
+pkg_version=1.7.0
+pkg_maintainer="The Habitat Maintainers <humans@habitat.sh>"
+pkg_license=('gplv2+')
+pkg_source=http://mama.indstate.edu/users/ice/tree/src/tree-${pkg_version}.tgz
+pkg_shasum=6957c20e82561ac4231638996e74f4cfa4e6faabc5a2f511f0b4e3940e8f7b12
+pkg_deps=(core/glibc)
+pkg_build_deps=(core/make core/gcc)
+pkg_bin_dirs=(bin)
+pkg_include_dirs=(include)
+pkg_lib_dirs=(lib)
+
+do_build() {
+  make
+}
+
+do_install() {
+  sed -i "s#prefix = /usr#prefix = ${pkg_prefix}#" Makefile
+  make install
+}