Support irm 03wla sensor

rspec result
```bash
morika-t@moog:~/work/iremocon$ bundle install --path vendor/bundle
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Installing diff-lcs 1.2.5
Using iremocon 0.0.1 from source at .
Installing rspec-support 3.1.2
Installing rspec-core 3.1.7
Installing rspec-expectations 3.1.2
Installing rspec-mocks 3.1.3
Installing rspec 3.1.0
Using bundler 1.6.0
Your bundle is complete!
It was installed into ./vendor/bundle
morika-t@moog:~/work/iremocon$ git log --oneline
f137306 Update README new sensor command
656dac1 Add commands for iRemocon WiFi(IRM-03WLA)
ae8e1c7 Fix Deprecation Warning
0771654 Take care of closing client socket in spec
3a2b959 Update README about official document
e55ad14 Silence command result in rspec
dca3d2b Update gemspec
5800dc3 Write README
2bf366f Respond to response at once
0593007 Set 51013 as default port
6b6fb8e Implement all commands on iremocon specification
f687700 Iremocon can connect to tcp server
d62dc03 Change Iremocon from module to class
3e29839 Initial commit
morika-t@moog:~/work/iremocon$  bundle exec rspec spec/iremocon_spec.rb
...................

Finished in 0.01686 seconds (files took 0.08322 seconds to load)
19 examples, 0 failures
```