v2.4

• Removed /dev folder from plugins directory. All /dev content can be found on the plugin-dev-old branch. As plugins from the /dev folder are updated and tested, they will be merged into the main repository branch.
• Added enforceArray method to the core library, to handle cases where blocks have a single trial and therefore the array specification for certain trial parameters is tedious. Currently, only the text plugin has been modified to take advantage of this method. Other plugins will be updated soon.
• The variables parameter was removed from the text plugin, since passing the parameter value as a function can achieve the same purpose and is easier to understand.