Added nix builds, travis CI

.travis.yml

@@ -0,0 +1,31 @@
+language: nix
+
+matrix:
+  fast_finish: true
+  include:
+    - env: GHCVER=ghc7102
+    - env: GHCVER=ghc7103
+    - env: GHCVER=ghc801
+    - env: GHCVER=ghc802
+    - env: GHCVER=ghc742
+    - env: GHCVER=ghc763
+    - env: GHCVER=ghc783
+    - env: GHCVER=ghc784
+    - env: GHCVER=ghcHEAD
+  allow_failures:
+    - env: GHCVER=ghc742
+    - env: GHCVER=ghc763
+    - env: GHCVER=ghc783
+    - env: GHCVER=ghc784
+    - env: GHCVER=ghcHEAD
+
+before_install:
+ - nix-channel --list
+ - nix-channel --update
+
+script:
+ - nix-build -A google-translate --argstr compiler $GHCVER
+
+cache:
+  directories:
+    - /nix/store

default.nix

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+{ compiler ? "ghc802", profiling ? false, haddock ? false }:
+  let
+   config = {
+     allowBroken = true;
+     packageOverrides = pkgs: {
+       haskell.packages.${compiler} = pkgs.haskell.packages.${compiler}.override {
+          overrides = self: super: rec {
+            mkDerivation = args: super.mkDerivation (args // {
+              # Only run tests on stripe-http-streams
+              doCheck = args.pname == "google-translate";
+              doHaddock = haddock;
+	      enableLibraryProfiling = profiling;
+            });
+            google-translate = self.callPackage ./google-translate.nix { };
+          };
+        };
+      };
+    };
+   in with (import <nixpkgs> { inherit config; }).haskell.packages.${compiler}; {
+     inherit google-translate;
+   }

google-translate.nix

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+{ mkDerivation, aeson, base, bytestring, http-api-data, http-client
+, servant, servant-client, stdenv, text, transformers
+}:
+mkDerivation {
+  pname = "google-translate";
+  version = "0.3";
+  src = ./.;
+  libraryHaskellDepends = [
+    aeson base bytestring http-api-data http-client servant
+    servant-client text transformers
+  ];
+  description = "Google Translate API bindings";
+  license = stdenv.lib.licenses.bsd3;
+}