Added ability to intercept -[UITextView paste:]

[harlanhaskins]

Added JSQComposerTextViewDelegate with optional method for intercepting pastes.
Added demo to demo app of pasting an image from the UIPasteboard.

[harlanhaskins]

Not quite sure why that build failed. It's some weird issue with DerivedData...

[jessesquires]

@harlanhaskins - nice! 👍

[jessesquires]

let's make this non-optional.

[harlanhaskins]

My thought was that the delegate could be used for more than just pasting, but I'll definitely make those changes first thing tomorrow. I'm using this fork for Bryx 911 now and it's working great!

[jessesquires]

1. left a few comments to address.
2. don't worry about travis-ci, i'll look into. it's been borked lately

[jessesquires]

@harlanhaskins - awesome! 👍

Regarding optional vs non-optional delegates: there are basically 2 methods to solve this kind of problem.

1. Having optional methods
2. Dividing up a protocol into multiple protocols (i.e., delegates).

With (2), you can achieve optionality by allowing the delegate to be nil. Good article by Ash, here: http://ashfurrow.com/blog/protocols-and-swift/

[wdcurry]

I luv the way you bork a repo ;)
"don't worry about travis-ci, i'll look into. it's been borked lately"

[jessesquires]

@wdcurry 😆

[harlanhaskins]

I went ahead and updated it. Should be ready to merge!

[jessesquires]

let's move this to the header file.

[jessesquires]

Hey @harlanhaskins ! I was about to merge and noticed a couple more changes.

Also, for doc comments, there should be 2 spaces after the *.

/**
*  Two spaces after the *
*  For each of
*  These lines :)  
*/

After this, I'll merge! 😄 Thanks again! 👍

[jessesquires]

Thanks @harlanhaskins ! 😄 🎉

[jessesquires]

@harlanhaskins - Just tested. This is awesome.

Submit more PRs plz. 😁