Refactoring vendoring and devops

#7

add state filter

#6

support printing state with color

• support printing state with color using fatih/color
• some refactoring

added tests and refactoring

• added tests
• modified package structure
• refactoring

Some todos

• respond to release and publish
• add show-build option
• add region assignable pattern

Some refactorings

• remove show sub command, and available with typing only lsec2
• un-use deprecated function of aws-sdk-go
• refactoring code structure
• vendoring support (required go 1.5 or later)
• modified document

First release

• First release