Add default.nix and make travis use 0.2 branches.

.travis.yml

@@ -4,7 +4,7 @@ ghc:
   - 7.8
 
 before_install:
-  - git clone https://github.com/haskell-servant/servant.git
+  - git clone -b servant-0.2 https://github.com/haskell-servant/servant.git
   - cabal sandbox init
   - cabal sandbox add-source servant/
 

default.nix

@@ -0,0 +1,21 @@
+{ pkgs ? import <nixpkgs> { config.allowUnfree = true; }
+, src ?  builtins.filterSource (path: type:
+    type != "unknown" &&
+    baseNameOf path != ".git" &&
+    baseNameOf path != "result" &&
+    baseNameOf path != "dist") ./.
+}:
+let
+  servant02 = pkgs.fetchgit {
+    url = https://github.com/haskell-servant/servant.git;
+    rev = "refs/heads/servant-0.2";
+    sha256 = "0mcn9d8hnijws1p8y6h3r0298f1x8mya2nshyi46mprrj2kn8wmm";
+  };
+in
+pkgs.haskellPackages.buildLocalCabalWithArgs {
+  name = "servant-client";
+  inherit src;
+  args = {
+      servant = import servant02 {};
+  };
+}

servant-docs.cabal

@@ -33,7 +33,7 @@ library
     , bytestring
     , hashable
     , lens
-    , servant >= 0.2.1
+    , servant >= 0.2.1 && < 0.3
     , string-conversions
     , system-filepath
     , text