first try of parse script data
simplify function is_ECMA_end()
add .gitignore file
add AAC and AVC packet type
Merge branch 'master' into develop-script

Conflicts:
	.gitignore
complete parsing metadata tag
Merge branch 'develop-script' into dev
fix a bug: some flv files may add not one but two end marker 009 in the end of metadata tag