readme updates, coveralls integration

.travis.yml

@@ -3,3 +3,11 @@ language: go
 go:
   - 1.3
   - tip
+
+before_install:
+  - go get github.com/axw/gocov/gocov
+  - go get github.com/mattn/goveralls
+  - go get golang.org/x/tools/cmd/cover
+
+script:
+    - $HOME/gopath/bin/goveralls -service=travis-ci -repotoken $COVERALLS_TOKEN

README.md

@@ -1,2 +1,8 @@
 # calc
+
+[![Build Status](https://travis-ci.org/kujenga/calc.svg?branch=master)](https://travis-ci.org/kujenga/calc)
+[![Coverage Status](https://coveralls.io/repos/kujenga/calc/badge.svg?branch=master&service=github)](https://coveralls.io/github/kujenga/calc?branch=master)
+
 A calculator built from scratch!
+
+Utilizes the [shunting yard](https://en.wikipedia.org/wiki/Shunting-yard_algorithm) algorithm to parse the input into rpn, then parses that postfix notation to return a result.