Start adding unit testing with busted and Travis-CI

.travis.yml

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+language: erlang
+
+env:
+  global:
+    - LUAROCKS_BASE=luarocks-2.0.13
+  matrix:
+    - LUA=lua5.1 LUA_DEV=liblua5.1-dev LUA_VER=5.1 LUA_SFX=5.1 LUA_INCDIR=/usr/include/lua5.1
+    - LUA=lua5.2 LUA_DEV=liblua5.2-dev LUA_VER=5.2 LUA_SFX=5.2 LUA_INCDIR=/usr/include/lua5.2
+    - LUA=luajit LUA_DEV=libluajit-5.1-dev LUA_VER=5.1 LUA_SFX=jit LUA_INCDIR=/usr/include/luajit-2.0
+
+before_install:
+  - if [ $LUA = "luajit" ]; then
+      sudo add-apt-repository ppa:mwild1/ppa -y && sudo apt-get update -y;
+    fi
+  - sudo apt-get install $LUA
+  - sudo apt-get install $LUA_DEV
+  - lua$LUA_SFX -v
+  # Install a recent luarocks release
+  - wget http://luarocks.org/releases/$LUAROCKS_BASE.tar.gz
+  - tar zxvpf $LUAROCKS_BASE.tar.gz
+  - cd $LUAROCKS_BASE
+  - ./configure
+    --lua-version=$LUA_VER --lua-suffix=$LUA_SFX --with-lua-include="$LUA_INCDIR"
+  - sudo make
+  - sudo make install
+  - cd $TRAVIS_BUILD_DIR
+
+install:
+  - sudo -E luarocks install busted
+
+script:
+  - sudo -E busted -v
+
+notifications:
+  email: false

spec/sfxr_spec.lua

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+require("busted")
+
+describe("Dynamic sound generator for Lua", function()
+end)