Update travis config

Bump setup scripts, use luacheck.

.luacheckrc

@@ -0,0 +1,2 @@
+std = "min"
+files["spec/"].std = "+busted"

.travis.yml

@@ -14,4 +14,5 @@ install:
   - sudo luarocks make
 
 script:
-  - busted spec
+  - busted
+  - luacheck src spec

.travis_setup.sh

@@ -5,8 +5,8 @@
 set -e
 
 if [ "$LUA" == "LuaJIT 2.0" ]; then
-  wget -O - http://luajit.org/download/LuaJIT-2.0.3.tar.gz | tar xz
+  wget -O - http://luajit.org/download/LuaJIT-2.0.4.tar.gz | tar xz
-  cd LuaJIT-2.0.3
+  cd LuaJIT-2.0.4
   make && sudo make install INSTALL_TSYMNAME=lua;
 else
   if [ "$LUA" == "Lua 5.1" ]; then
@@ -23,15 +23,8 @@ else
 fi
 
 cd ..
-
+wget -O - http://luarocks.org/releases/luarocks-2.2.2.tar.gz | tar xz
-if [ "$LUA" == "Lua 5.3" ]; then
+cd luarocks-2.2.2;
-  git clone https://github.com/keplerproject/luarocks
-  cd luarocks
-  git checkout 0f1c93774669468c5165be2711325224388aed41;
-else
-  wget -O - http://luarocks.org/releases/luarocks-2.2.0.tar.gz | tar xz
-  cd luarocks-2.2.0;
-fi
 
 if [ "$LUA" == "LuaJIT 2.0" ]; then
   ./configure --with-lua-include=/usr/local/include/luajit-2.0;

.travis_setup_rocks.sh

@@ -1,8 +1,15 @@
-# A script for setting up broken Lua rocks for travis-ci testing.
+# A script for setting up Lua rocks for travis-ci testing.
 
 sudo luarocks install dkjson --deps-mode=none
 
-git clone https://github.com/Olivine-Labs/busted
+mkdir busted
+wget -O - https://api.github.com/repos/Olivine-Labs/busted/tarball/master | tar xz -C busted --strip-components=1
 cd busted
 sudo luarocks make busted-scm-0.rockspec
 cd ..
+
+mkdir luacheck
+wget -O - https://api.github.com/repos/mpeterv/luacheck/tarball/master | tar xz -C luacheck --strip-components=1
+cd luacheck
+sudo luarocks make
+cd ..