added badges for build status

Author: danielrh

README.md

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 # Framework for allocating memory in #![no_std] modules.
 
+[![crates.io](http://meritbadge.herokuapp.com/alloc-no-stdlib)](https://crates.io/crates/alloc-no-stdlib)
+[![Build Status](https://travis-ci.org/dropbox/alloc-no-stdlib.svg?branch=master)](https://travis-ci.org/dropbox/alloc-no-stdlib)
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 ## Requirements
  * Rust 1.6