Enhance/ci (#508)

* WIP travis integration

* WIP add build step

* Add build and twitter badge

.travis.yml

@@ -0,0 +1,9 @@
+language: objective-c
+osx_image: xcode9.2
+xcode_project: CVCalendar.xcodeproj
+env:
+  global:
+    - LC_CTYPE=en_US.UTF-8
+    - LANG=en_US.UTF-8
+script:
+  xcodebuild | xcpretty -c

README.md

@@ -4,6 +4,8 @@
 
 ![pod](https://img.shields.io/cocoapods/v/CVCalendar.svg)
 [![License](https://img.shields.io/cocoapods/l/CVCalendar.svg)](http://cocoapods.org/pods/CVCalendar)
+[![Build Status](https://travis-ci.org/CVCalendar/CVCalendar.svg?branch=master)](https://travis-ci.org/CVCalendar/CVCalendar)
+[![Twitter](https://img.shields.io/badge/twitter-@elsesiy-blue.svg)](http://twitter.com/elsesiy)
 
 Overview
 ==========