[travis.yml] added install-script & luacheck install command in travis.

#77

- added travis.yml with dependencies installation script.
- added luacheck test command in runtests script.
- fixed accessing undefined variable `uci` warning

Fixes #77

.travis.yml

@@ -0,0 +1,13 @@
+# .travis.yml
+language: python
+sudo: true
+env:
+  - LUA="lua=5.1.5"
+before_install:
+  - sudo ./install-dev.sh
+
+install:
+  - sudo luarocks install luacheck
+
+script:
+  - ./runtests

openwisp-config/tests/test_utils.lua

@@ -2,7 +2,7 @@
 package.path = package.path .. ';../files/lib/?.lua'
 require('os')
 require('io')
-require('uci')
+uci = require('uci')
 local utils = require('openwisp.utils')
 luaunit = require('luaunit')
 write_dir = './utils'

runtests

@@ -1,6 +1,7 @@
 #!/bin/bash
 set -e
 cd openwisp-config/tests/
+luacheck . -d -a -r
 lua test_store_unmanaged.lua -v
 lua test_restore_unmanaged.lua -v
 lua test_uci_autoname.lua -v