Add mdl_ prefix to attributes

[MichaelRocks]

This patch makes the library compatible with Design Support library and fixes #274, #289, #277 and #279

[sohayb]

@navasmdc please make this happen!

[krazykira]

I was getting the exception

Error:(1) Attribute "rippleColor" has already been defined

But it was solved when i modified my build.gradle by removing

compile 'com.android.support:design:22.2.0'

and adding

//Not adding this was causing error during runtime 
compile 'com.nineoldandroids:library:2.4.0'

So now i am wondering about whether what i did was a fix or was it just a temporary workaround ?

[mychaelgo]

@navasmdc please merge it

[adennie]

Any hope of getting this merged? There seem to be lot of people having this rippleColor conflict.

[geraldokandonga]

I just used the same code and i got the same error what do i do please help

[hojatdelfan]

thanks