Added the option to use a different key
Indenting with spaces to match existing lines
Update CONTRIBUTING.md

fixed misspelling on 'effectively'
Merge pull request #35 from AaronHolbrook/patch-1

Update CONTRIBUTING.md

Thank you sir!
Fixed a syntax error in the fields array example
Merge pull request #33 from studioanino/custom-meta-key

Allow filtration of meta key used for data storage
Added date() function for each attachment to retrieve the date and time of the upload
Opted with a filter instead of constant for controlling the meta key used for data storage. Added two filters: attachments_meta_key to filter said meta key, and attachments_get_{my_instance} that facilitates sorting Attachments per instance. Fixed PHP Warnings when Network Activated, and fixed an issue where the $index param wasn't properly passed to two methods.
Added ability to prepend new Attachments instead of append them. Readme updates.
Abstracted the migration and search methods into their own classes
Fix Typo
Merge pull request #37 from hasinhayder/master

Added date() function in class.attachments.php
Merge pull request #39 from jrtashjian/master

Quick typo fix.
Removed reliance on determining image sizes at instantiation. Fires too soon to take into account image sizes created by other plugins.