Add bintray publish plugin

This PR update gradle configuration in order to release to Bintray.


`version.properties`
On 14 Oct 2014 16:52, "Ataul Munim" <ataul@novoda.com> wrote:

> It's with other things that don't change like the artifact id
> On 14 Oct 2014 16:50, "Xavi Rigau" <notifications@github.com> wrote:
>
>> In team-props/publish.gradle:
>>
>> > @@ -0,0 +1,14 @@
>> > +ext {
>> > +    PUBLISH_GROUP_ID = 'com.novoda'
>> > +    PUBLISH_ARTIFACT_ID = 'merlin'
>> > +    PUBLISH_VERSION = '0.6'
>>
>> it is in its own file already publish.gradle
>>
>> —
>> Reply to this email directly or view it on GitHub
>> <https://github.com/novoda/merlin/pull/36/files#r18837743>.
>>
>

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