support content-type "text/xml"

[feitian124]

try fix #164
the default sails http middleware seems not work with 'text/xml' post request well and result error in req, which not fire load function at all.

after debug, there are two way to fix this:

1. parser req.weixin in a middleware before invoke wechat, since wechat will use it directly if find it.
2. override sails body-parse using express-xml-bodyparser then use the result in load.

this PR implement 2.

thanks.

[coveralls]

Coverage decreased (-0.27%) to 91.69% when pulling 903d212 on feitian124:master into 199cdfa on node-webot:master.

[JacksonTian]

应该是判断到rawBody存在以后，就不要去侦听data和end事件了

[feitian124]

恩，貌似更合理一点，我去改下。

[coveralls]

Coverage decreased (-0.56%) to 91.4% when pulling 7e20aa2 on feitian124:master into 199cdfa on node-webot:master.

[feitian124]

想加一个测试， 按照 supertest 的文档， 应该是可以直接 post joson 的， 但我在这里试了下最简单的例子也不行，先注释掉测试了， 有空帮看看。

[JacksonTian]

landed in 187b0e2

[JacksonTian]

1.2.5 published

[feitian124]

good, thanks.

[JacksonTian]

能分享下 rails下的接入形式么。

[feitian124]

rails? 我是 sails。。

[JacksonTian]

sails。嗯。说错。

[feitian124]

YunnuY/sweat#1

上面咯，正好有个 issue 没搞定， 是不是 js 里面的 this 上下文不对引起？ ^ ^

[JacksonTian]

对sails结构不太熟。详细引用有吗

[feitian124]

详细引用? 不太懂你什么意思.
sails 是基于 expressjs 仿 rails 的一个框架吧, 还挺方便的.