Replace appveyor.yml with .travis.yml

Also fix issue with LuaJIT 2.1 on Python 3

.travis.yml

@@ -0,0 +1,24 @@
+language: c
+sudo: false
+
+cache:
+  directories: cache
+
+matrix:
+  include:
+    - compiler: ": Lua 5.1"
+      env: LUA="lua 5.1"
+    - compiler: ": Lua 5.2"
+      env: LUA="lua 5.2"
+    - compiler: ": Lua 5.3"
+      env: LUA="lua 5.3"
+    - compiler: ": LuaJIT 2.0"
+      env: LUA="luajit 2.0"
+    - compiler: ": LuaJIT 2.1"
+      env: LUA="luajit 2.1"
+
+script:
+  - python hererocks.py here --$LUA -r^ --downloads cache --builds cache
+  - export PATH=$PATH:$PWD/here/bin
+  - lua -v
+  - luarocks --version

appveyor.yml

@@ -1,21 +0,0 @@
-version: 1.0.{build}
-
-shallow_clone: true
-
-environment:
-  matrix:
-  - LUA: 5.1
-  - LUA: 5.2
-  - LUA: 5.3
-
-configuration: MinGW
-
-platform: x86
-
-install: cinst python
-
-before_build: set PATH=C:\mingw\bin;%PATH%
-
-build_script: python hererocks.py here --lua "%LUA%" --verbose
-
-test_script: here\bin\lua -v

hererocks.py

@@ -200,7 +200,7 @@ def fetch(versions, version, temp_dir, targz=True):
     if clone_command == "git clone" and ref != "master":
         run_command("git checkout", quote(ref))
 
-    commit = exec_command(True, "git rev-parse HEAD").strip()
+    commit = exec_command(True, "git rev-parse HEAD").strip().decode("utf-8")
     return result_dir, [name, "git", url_to_name(repo), url_to_name(commit)]
 
 lua_version_regexp = re.compile("^\\s*#define\\s+LUA_VERSION_NUM\\s+50(\d)\\s*$")