Remove checked in ajtcl files and Misc ios build fixes

This PR contains the following build related fixes:
* Removes the checked in ajtcl files from the plugin. It looks like they were added to the .gitignore but the change to remove them was lost in a merge.
* Return a promise so that Cordova waits for our hook scripts to finish executing. Adding the plugin failed for me due to attempting to install the source files before they were pulled down.
* Have the git hook be of type before_plugin_install instead of after_plugin_add. After_plugin_add was not running for me. Moving to before install got the script executed (as does the patching script).

**I am still learning the project, process and tech. So this PR is both to go through the PR process sooner and to validate some of the things I hit when trying to build a iOS project with the plugin.**