Added time log in download

git-svn-id: http://svn.code.sf.net/p/gpac/code/trunk/gpac@5534 63c20433-aa62-49bd-875c-5a186b69a8fb
attempt a complete build with TravisCI

git-svn-id: http://svn.code.sf.net/p/gpac/code/trunk/gpac@5535 63c20433-aa62-49bd-875c-5a186b69a8fb
Make sure cache dir exists and is writable, plus fixed a bug in file stats when cached and not modified

git-svn-id: http://svn.code.sf.net/p/gpac/code/trunk/gpac@5536 63c20433-aa62-49bd-875c-5a186b69a8fb
Now using FFMPEG 2.4.3 for android

git-svn-id: http://svn.code.sf.net/p/gpac/code/trunk/gpac@5537 63c20433-aa62-49bd-875c-5a186b69a8fb