This commit contains a number of changs that make this plugin useful for Embedded Artistry's purposes. Changes include:

- Removing the _ directory prefix
- Supporting additional post types (courses, lessons, newsletters, field atlas entries, glossary entries), including specific file organization schemes for each type
- Set the user to the configured user in the import/export paths
    + This addresses a problem we had where the initial export would differ from the import/export from GitHub and Wordpress. By setting the same user, we resolved the problems the difference in user permissions incurred
- Modified commit messages to our preferred format
- Removed option to delete posts on import (should happen from wordpress front-end)
- Removing the ability to file new posts by adding a file in GitHub (expected workflow is to go through the website to create posts)
- Removed support for drafts and images
- Disabled the "Edit" link taking you to GitHub - we need the Wordpress front-end for our custom post types and their metadata

In addition, other cleanup was performed:

- Update version to 1.2
- Adjusted some details from litefeel->embeddedartistry
- Refactoring filename/directory logic in post.php
- Removing commented out code
- Adding error log statements for different failure conditions so that we have transparency when an import or export fails
- Ignore composer.lock file, since it's generated during the plugin setup process
- Removed function in CLI causing an error - app->export->set_user() referenced an unused option name
    + Instead, this CLI path calls the wordpress set user functionality

Relates to #4

Fixes #5

… is working through hooks

…ce orders

We were setting the current user for permissions purposes when exporting lesson content managed by other teachers. However, we set the current user before we checked to see if the post that triggered the action was even a valid one (hint: orders are not). We also changed the user but did not change back to the original user before returning. This culminated in all orders on stripe showing up under the default user.