Add boolean and number to Literal's value property
Add boolean and number to Literal's value property

Fixes #1471
Closes gh-1473

ariya/esprima,jquery/esprima,ariya/esprima,bcbcarl/esprima,jquery/esprima,jquery/esprima,bcbcarl/esprima,ChromeDevTools/esprima,bcbcarl/esprima,ChromeDevTools/esprima,ChromeDevTools/esprima,ariya/esprima