Update class-plugin-name.php

Added multisite activation/deactivation functionality.
Fix typo and move add_filter under menu add_action
Add missing *
Merge pull request #70 from grappler/patch-1

Fix typo and move add_filter under menu add_action
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.
Merge pull request #72 from GaryJones/feature/trailingslashit

Make WP_LANG_DIR constant safer
Change default capability to 'manage_options'

I am not sure if it's a good idea to use 'read' here, as more people will use the plugins page for options that subscribers... should never see.
I am not blaming you, it was me not paying attention but after migrating my plugin to this awesome boilerplate it ended up on WP.org with 'read' for the entire options page and people are now complaining ;)
Merge pull request #58 from thuijssoon/master

Multisite activation / deactivation
Merge pull request #71 from GeertDD/const

Updates related to the new VERSION constant
Merge pull request #74 from nextgenthemes/master

Change default capability to 'manage_options'
removing the lang directory in place of languages
changing the name of the lang directory to languages and all references to it
Initialize plugin on plugins_loaded hook
Merge pull request #76 from barryceelen/patch-1

Initialize plugin on plugins_loaded hook
Removes reference to register_uninstall_hook from code comment

Perhaps mention uninstall.php in stead?

```
// Register hooks that are fired when the plugin is activated or deactivated.
// When the plugin is deleted, the uninstall.php file is loaded.
```
Mention uninstall.php in code comment
Removes 'Change 'plugin-name' to the name of your plugin' from DocBlock

Removes 'Change 'plugin-name' to the name of your plugin' from add_plugin_admin_menu() function DocBlock, as this is now defined via a variable.