add HexNumberLiteral

- add scanner for Hex Number
- fix test cases
- build v0.0.24
Merge pull request #33 from mohayonao/fix-numeric-literal

add HexNumberLiteral
fix UnaryExpression

- fix test cases
- fix UnaryExpression -
- build v0.0.25
Merge pull request #34 from mohayonao/fix-unary-expression

fix UnaryExpression
Merge branch 'master' into gh-pages
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