Change text of Checkbox

- const value -> const
Convert to HTML entities #3

- Add Convert to Html Entities Action
- Add Convert to String Action
Update README
Update description
Update version number to 0.7.0
Fix incorrect result of conversion to short array syntax #4

- Check whether TokenId is PHP_TOKEN because it may be PHP_ENCAPSED_AND_WHITESPACE
Merge branch 'nb74' into nb80
Merge branch 'nb80' into nb74
Fix issue #5

- Object operator is not inserted when field is used
- Add condition for PHPTokenId
Update version number to 0.7.1
Merge branch 'nb74'