Minor cleanup of the README file
Merge pull request #309 from jlund/readme-cleanup

Minor cleanup of the README file
added two main features
cleanup of the README.markdown file to reflect to Joshua Lund's commit
compile warning

compile warning:argument 'nret' might be clobbered by 'longjmp' or
'vfork'[-Werror=clobbered]
Merge pull request #310 from zhuzhaoyuan/cleanup-readme-markdown

Cleanup readme markdown
Merge pull request #311 from diwayou/master

ngx lua module compile warning
Merge branch 'master' into tengine-1.5.1
updated the changelog