add alias of `modulo`, `remainder`, `quotient`
`quotient` is defined in base
primary symbol to object hashtable support (dictionary)
add dictionary-size
dictionary-delete raises an error when no binding with given name is registered
add dictionary documentation
Merge branch 'dictionary'
add libs.rst
experimentally changed document nest lavel
use topic directive instead
try using glossary directive
use list notation and italic
bold is more rational
fix grammatical error
add deploy.rst
forgot to update index.rst
add doc url
__builtin_unreachable appeared in gcc 4.5.0
add a commentary on build pre-requisites
fix indentions