Sometimes while deploying your app to SharePoint 2013, you might get the error as "Error occurred in deployment step 'Install App for SharePoint': Sideloading of apps is not enabled on this site."
In CodePlex Tobias Lekman Shareed a PowerShell script to resolve the issue.
So first download and install SharePoint Online Management Shell Preview from this URL
Then download the Tobias Lekman PowerShell Script from this URL
and execute execute it within the SharePoint Online Management Shell.
According to Tobias Lekman they are not recommending it for Production sites. But He is recommening for Dev environments.
Also you can check out my previous posts on: