Iglistkit: Cut 3.0.0 release

[rnystrom]

• [x] Final review and update of header docs and guides
• [x] Final review of changelog
• [x] Regenerate docs
• [x] Update pod spec version
• [x] Update xcodeproj version
• [x] Run pod install on all examples (must happen on FB internal because of sync issues)
• [x] Merge master into stable via cmd-line and push
• [x] Confirm stable is 0|0 ahead/behind
• [x] Create GitHub release from stable
• [x] Paste changelog into GH release notes
• [x] Publish GitHub release
• [x] Run pod lib lint
• [x] Push updated podspec: pod trunk push IGListKit.podspec
• [x] Verify new release on CocoaPods
• [x] Tweet all the tweets

[rnystrom]

Blocked on #593, #661, and #671

[amonshiz]

671 is now closed

[Sherlouk]

Not sure if this is covered by Final review and update of header docs and guides but we need to update all the version references to 3.0 (for example the installation guide and on the readme)

[jessesquires]

@Sherlouk yep! want to PR that?

[jessesquires]

@rnystrom @amonshiz @Sherlouk

looks like 3.0 is ready! just need to re-gen docs (#728) and double check that everything is good to go.

all extra eyes will help! 👀

[jessesquires]

3.0 is released!