trigger event when files are added for upload
add option to only manage a single file upload
bump to 0.1.3
Fix IE9 bug where data[1].value (aka 'key') is not set properly
Change optional config values from empty string to nil

Empty strings are truthy, causing default values from being set.
Fix IE <= 9 bug where settings.path is appended twice.

https://github.com/waynehoover/s3_direct_upload/issues/82#issuecomment-17904169

We remove `settings.path` from line 117 and not on line 107 because the form that gets submitted needs to send `settings.path`.
Merge pull request #81 from heeton/master

Trigger 'file_added' event
Merge pull request #87 from Hengjie/master

Fix IE9 issue with timestamp/unique_id
Merge pull request #89 from dbryand/master

Update config in Readme replacing "" with nil.
version bump to 0.1.4
update readme for file_added event
Merge remote-tracking branch 'upstream/master'
removed variables from @key name
Merge branch 'develop'