Fixes classpath definition in build.xml
- The version of POI using is 3.7
Exclude Ant runtime when compiling using javac
- It is usually best to set this to false so the script's behavior
  is not sensitive to the environment in which it is run
  http://ant.apache.org/manual/Tasks/javac.html
Adds copyconfig task
* The copyconfig is intented to copy all 'instance specific' files to the
  current project. This avoid the needs of handling instance files with shell
  scripts
Updates task to deploy instance to use appcfg.sh
* Instead of using the defined macros, we use the /bin/sh to execute
  the appcfg.sh
Merge branch 'master' of https://github.com/akvo/akvo-flow into develop