Add php7 package

packages/php7.rb

+require 'package'
+
+class Php7 < Package
+  version '7.0.14'
+  source_url 'http://php.net/get/php-7.0.14.tar.gz/from/this/mirror' # software source tarball url
+  source_sha1 '7d098167c63446011e87b1d1578f2f3ac0bab01a'  # source tarball sha1 sum
+  
+  depends_on 'nginx'
+  depends_on 'libxml2'
+  
+  def self.build                                                  # self.build contains commands needed to build the software from source
+    system "./configure"
+    system "make"                                                 # ordered chronologically
+  end
+
+  def self.install                                                # self.install contains commands needed to install the software on the target system
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"          # remember to include DESTDIR set to CREW_DEST_DIR - needed to keep track of changes made to system
+  end
+end