Authored by Bogdan Poplauschi

Updated Changelog and added Changelod to workspace

## [3.7.4 Patch release for 3.7.0 with tvOS support on Jan 8th, 2016](https://github.com/rs/SDWebImage/releases/tag/3.7.4)
#### Updates
- bumped `libwep` version to `0.4.4`
#### Features:
- added tvOS support #1327 and #1358 - fix #1368 and #1302
#### Fixes:
- #1217 contains several of the above fixes
- fix #391 -> option to cache only on Disk. will replace #1130
- fix #343 -> iCloud backup Option
- fix #371 -> CGBitmapContextCreate: unsupported parameter combination + #1268 #1412 #1340
- fix #576 -> scale set to screen scale
- fix #1035 -> progress queue with dispatch_async
- new feature -> activity indicator using auto layout. The activity indicator feature will replace #131
- #1218 progress callbacks now report on main thread - fixes #1035
- #1321 Added a new constructor to SDWebImagePrefetcher - replaces #956
- #976 append the original path extension to the hash filename - fixes #967
- replaced #999 with #1221
- added cache tests #1125
- #1236 fixes #1203
- bf899e2 fixes #1261 #1263 compilation issue CocoaPods vs non-CocoaPods
- #1367 fixes a bug where image scale & orientation are ignored when decoding / decompressing an image
- cac21e1 fixes #1366, addresses #1350 and reverts a part of #1221 - from commit 6406d8e, the wrong usage of dispatch_apply
- #1363 fixes #1361 sd_cancelBackgroundImageLoadForState
- #1348 Create a strong ref of weakOperation in the entry of The image download subOperation, use the strong ref instead weakOperation. At the same time, repair some logic of the 'If cancelled'
- dcb7985 replaces #1345 - Load local credential file
- #1323 don't to perform download if url is "" but not nil
- #1310 Added support for SDWebImageAvoidAutoSetImage option to UIButton and highlighted UIImageView categories
- #1308 Added Swift installation tips
- 32923fa Xcode 7.1 updates
- #1297 cleaner implementation of failedUrl error handling - fixes #1275
- #1280 Fix sd_animatedImageByScalingAndCroppingToSize
- Remove logging from the image prefetcher - #1276
- Fix typos #1256 #1257 #1258 #1331 #1290
## [3.7.3 Patch release for 3.7.0 with iOS8+ framework and Carthage on Jun 13th, 2015](https://github.com/rs/SDWebImage/releases/tag/3.7.3)
- Adds support for **iOS 8+ Framework and Carthage** [#1071](https://github.com/rs/SDWebImage/pull/1071) [#1081](https://github.com/rs/SDWebImage/pull/1081) [#1101](https://github.com/rs/SDWebImage/pull/1101)
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