Add Travis CI and LuaCheck (#3)

.luacheckrc

@@ -0,0 +1,21 @@
+unused_args = false
+max_defined_top = true
+max_line_length = 999
+
+globals = {
+    "minetest", "debug",
+    "io", "coroutine",
+}
+
+read_globals = {
+    string = {fields = {"split", "trim"}},
+    table = {fields = {"copy", "getn"}},
+}
+
+files["init.lua"].ignore = { "rawlen", "string", "ie" }
+files["StackTracePlus/src/StackTracePlus.lua"].ignore = { "" }
+files["StackTracePlus/test/test.lua"].ignore = { "" }
+files["StackTracePlus/test/test_questionmark.lua"].ignore = { "" }
+files["StackTracePlus/unittest/test.lua"].ignore = { "" }
+files["StackTracePlus/src/StackTracePlus.lua"].ignore = { "" }
+                                                -- ^ Ignore everything

.travis.yml

@@ -0,0 +1,11 @@
+language: generic
+addons:
+  apt:
+    packages:
+    - luarocks
+before_install:
+  - luarocks install --local luacheck
+script:
+- $HOME/.luarocks/bin/luacheck .
+notifications:
+  email: false

README.md

@@ -1,4 +1,5 @@
 # StackTracePlus
+[![Build Status](https://travis-ci.org/MinetestForFun/stacktraceplus.svg)](https://travis-ci.org/MinetestForFun/stacktraceplus)
 
 StackTracePlus is a Lua module that extends `debug.traceback` to include more
 call frame information such as local and globals, locals and parameters