captcha 0.1.6

generate captcha library

#Changelog

##0.1.6

• add mac os x support

###0.1.5

• fix file sync bug
• change captcha offset

###0.1.4

• change readme.md install wiki

###0.1.3

• change library name

###0.1.2

• change captcha default height

###0.1.2

• add windows support

###0.1.1

• invoke c method with dart

###0.1.0

• generate captcha with c lang