📝 Generate phpdoc

Version++ (1.4.0)

Merge pull request line#42 from tamucola/master

add getMessageType

Add hacking guide for SDK developers

Version++ (1.2.0)

Merge pull request line#30 from line/fix/base_uri_handling

Fix the handling to specify endpoint base URI

Merge pull request line#14 from line/v2

Support the latest LINE Messaging API

📝 fix doc

Add travis setting

Correct license name