updating a reference to the plugin slug

fixes #52
added empty array for dependency to fix version number.
Adding index.php with silence is golden security method
Update class-plugin-name.php

Added multisite activation/deactivation functionality.
replacing all instances of PluginName with PluginName as per the WordPress Coding Standards

fixes #61
updating the change log to reflect the current changes
removing whitespace
removing an improper apostraphe
updating the change log
Add action link to plugin page
Fix typo
Fix loading textdomain when the plugin is symlinked

plugin_basename doesn't return the correct path if the plugin is symlinked into webdir/wp-content/plugins/. This fixes the problem.
Removing useless closing php tags
Storing plugin version in a class constant
Fix typo and move add_filter under menu add_action
Add missing *
Update activate_new_site did_action to become Yoda condition
@const is not an official part of PHPDoc

Pointed out by @GaryJones: https://github.com/tommcfarlin/WordPress-Plugin-Boilerplate/commit/4d629b53238b101f71e718f4c41de45997298a69#commitcomment-3943262
Replacing `$this->version` by the new class constant
Make WP_LANG_DIR constant safer

We assume that someone defining WP_LANG_DIR will do so without a trailing slash, since we then add our own before adding in the rest of the path to the .mo file.

This change gets removes that assumption by removing our own slash from the string, and wrapping WP_LANG_DIR in trailingslashit() instead.