added controlling files for travis ci

.luacheckrc

@@ -0,0 +1,7 @@
+allow_defined_top = true
+
+read_globals = {
+	"minetest",
+	"dump", "vector",
+	"VoxelManip", "VoxelArea",
+}

.travis.yml

@@ -0,0 +1,12 @@
+language: generic
+sudo: false
+addons:
+  apt:
+    packages:
+    - luarocks
+before_install:
+  - luarocks install --local luacheck
+script: 
+- $HOME/.luarocks/bin/luacheck --no-color .
+notifications:
+email: false