release 0.54.3

ab93ab47 update README bump version to 0.54.3  ( zxcpoiu 2016-11-25 10:12:30 +0800)
7fae599a more detailed step 5  ( Sagiv Ofek 2016-11-24 16:21:51 -0500)
2369679d android: more removeVideoCapturer() checks follow up  ( zxcpoiu 2016-11-21 15:18:36 +0800)
fbd489a5 android: Keep reference to VideoCapturers and dispose of them with media stream  ( Scott Twiname 2016-11-21 11:29:50 +1300)
331164f2 Update README.md  ( zxcpoiu 2016-11-14 15:50:12 +0800)
2065f5cc Update README.md  ( zxcpoiu 2016-11-14 15:48:39 +0800)