Change the hash-style to 1.8.7 for backward compatibility

DESC:
[Change]
1. Change the hash-style to 1.8.7 for backward compatibility
(1). Change the hash in data method.
(2). Remove the redundant files.
Add version badge in README

DESC:
[Change]
1. Add version badge in README
Update README for new interface

DESC: C
Refine interface

DESC: C
Release v1.0.0

DESC: RS
Modify code to support ruby 1.8

DESC: C
Modify code to support ruby 1.8

DESC: C
Modify test to support ruby 1.8

DESC: C
Add travis and coverall badges in README

DESC: A