Update todo.md
Update README.md
text/scanner
resolve conflict
完成目录
structing todo.md
net/mail: finish example
Merge remote-tracking branch 'upstream/master'
Merge pull request #28 from Unknwon/master

结构化todo.md
Merge pull request #29 from andelf/master

net/mail: finish example
add build
format todo.md
Merge remote-tracking branch 'gopkg/master'
format todo.md
Update README.md
text/scanner package samples
今天先测试一下。

具体例子逐步加入。
constants and formats
markdown syntax
Merge remote-tracking branch 'upstream/master'