Added CHANGELOG.md and bump version to v1.2.0

Change-Id: Iab4a6085ad97fa04a319013ff70c3450511ebc52

CHANGELOG.md

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+## [1.2.0] - 2015-10-01
+### Added
+- Added [docker](https://www.docker.com/) support. Thanks @leandromoreira.
+
+### Changed
+- Improved performance with threaded I/O.
+- Disabled gold linker by default, which does not work on Ubuntu 64bit server.
+- Delete temperary files created by packager when done.
+- Updated MediaInfo file formats.
+
+### Fixed
+- Support ISO-BMFF files with trailing 'moov' boxes.
+- DASH-IF IOP 3.0 Compliance. Some changes are controlled by flag
+  `--generate_dash_if_iop_compliant_mpd`. It is defaulted to false, due to lack
+  of player support. Will change the default to true in future releases.
+  - Added @contentType to AdaptationSet;
+  - For video adaptation sets, added `@maxWidth/@width, @maxHeight/@height,
+    @maxFrameRate/@frameRate and @par` attributes;
+  - For video representations, added `@frameRate and @sar` attributes;
+  - For audio adaptation sets, added `@lang` attribute;
+  - For representations with aligned segments/subsegments, added attribute
+    `@subSegmentAlignment/@segmentAlignment`;
+  - Added cenc:default_KID and cenc:pssh to ContentProtection elements;
+  - Moved ContentProtection elements up to AdaptationSet element, controlled by
+    `--generate_dash_if_iop_compliant_mpd`;
+  - Moved representations encrypted with different keys to different adaptation
+    sets, grouped by `@group` attribute, controlled by
+    `--generate_dash_if_iop_compliant_mpd`.
+- Fixed SSL CA cert issue on CentOS.
+- Fixed a couple of packager crashes on invalid inputs.
+- Read enough bytes before detecting container type. This fixed MPEG-TS not
+  recognized issue on some systems.
+- Generate proper tkhd.width and tkhd.height with non-square pixels.
+- Support composition offset greater than (1<<31).
+- Fixed one-sample fragment issue with generated audio streams.
+- Fixed and correct width/height in VisualSampleEntry for streams with cropping.
+  This fixes encrypted live playback issue for some resolutions.
+
+## [1.1.0] - 2014-10-14
+### Added
+- Added timeout support for encryption key request.
+- Support mpd generation in packager driver program.
+- Support segment template identifier $Time$.
+- Support configurable policy in Widevine encryption key request.
+- Support key rotation, with configurable crypto_period_duration.
+- Support UDP unicast/multicast capture.
+- Support auto-determination of SD/HD track based on a configurable flag
+  `--max_sd_pixels`.
+- Support new input formats:
+  - WVM (legacy Widevine format), both encrypted and clear;
+  - CENC encrypted ISO-BMFF.
+
+### Changed
+- Replaced HappyHttp with curl for http request. Added https support.
+- Changed packager driver program to be able to package multiple streams.
+- Move source code into packager directory, to make it easier to third_party
+  integration.
+
+### Fixed
+- Support 64 bit mdat box size.
+- Support on 32-bit OS.
+
+## 1.0.0 - 2014-04-21
+First public release.
+
+### Added
+- Repo management with gclient from Chromium.
+- Support input formats: fragmented and non-fragmented ISO-BMFF.
+- Support encryption with Widevine license server.
+- Support encryption with user supplied encryption keys.
+- Added packager driver program.
+- Added mpd_generator driver program to generate mpd file from packager generated
+  intermediate files.
+
+[1.2.0]: https://github.com/google/edash-packager/compare/v1.1...v1.2.0
+[1.1.0]: https://github.com/google/edash-packager/compare/v1.0...v1.1