Only send SMS if it is a mobile number, do not delete parent activity as it might be shared between many users

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* CRM-12109: Automatically append JIRA links to Git tickets
  http://issues.civicrm.org/jira/browse/CRM-12109

This allows one to test the tarballs produced by distmaker before publishing anything.

Add script to download the releaser+gitify. This should be used on the production build environment instead of maintaining an extraneous working-copy.

 * Fetch code with "gitify"
 * Make coordinated tags and push them (instead of using post-commit hook on single repo)
 * Extract hard-coded references to sf.net
 * Split into smaller functions (which are more explanatory and easier to toggle for testing)
 * Document configuration file format
 * Rename executable variables (e.g. $php => $cmd_php)
 * Use "set -ex" to catch errors