Install script inserts only those trigger handlers that did not already exist. Test included.
Creating uninstall script. Test included.
Also, centralizing the name of our global scheduled job.
Merge dev into feature/459-install-script-fix
Adding functionality to later build a separate package.xml ONLY from managed package. We cannot specify install and uninstall classes for unmanaged package.
Merge branch 'feature/459-install-script-fix' of https://github.com/SalesforceFoundation/Cumulus into feature/459-install-script-fix
Merge dev into feature/459-install-script-fix
Merge dev into feature/459-install-script-fix
Merge pull request #546 from SalesforceFoundation/feature/459-install-script-fix

Feature/459 install script fix
Merge dev into feature/409-address-mgmt