Merge pull request OpenVisualCloud#223 from xwu2git/master

accumulative fixes

Merge pull request OpenVisualCloud#123 from xwu2git/master

fix font file path

Merge pull request OpenVisualCloud#111 from QuPengfei/master

update to 20.1 for ffmpeg and gst

Merge pull request OpenVisualCloud#60 from QuPengfei/r3-rel

Misc readme update

Merge pull request OpenVisualCloud#46 from fkhoshne/update_va_service…

…_gst_plugins_v0.4.2

Update gst va plugins in va service to v0.4.2

Merge pull request OpenVisualCloud#12 from ywu75/master

enable travis ci