- Remove RArray type since its basically a normal *RClass.
- Remove arrayClass variable because ...

This reverts commit 739989d1e84edf09343c021a9c93b937513ae8fa, reversing
changes made to 1fea5171...

Implement #208

#202 Implementing Range#bsearch API

Fix vm issues

TODO: Make class initialization process bind with VM.

#184 Rearrange String Test

Implement #210

By adding index we can know what test case failed.

Add compiler package

Now by default we compile program into instruction sets only, not to
bytecode string (reduce an ...

#182 Implementing Fundamental Range API

Use checkExpected for all test result checking.

#196 Init string handled with carriage returns or whitespace case

#191 [VM Part] Add Negative Index Support for Array API Method

Default arg value

TODO: Refactor this implementation when we can put metadata inside
generate bytecode.

It's basi...

Add `String#include`

Add and update API documents

Add route method like get, post...etc.

For example:

```ruby
def foo(x)
yield(x + 10)
end

def bar(y)
foo(y) do |f|
yield(f) # ...

Add test for igb.Start()

Because I have problem simulating user input in tests, so I make
Start() to receive channel as a...

Add REPL (igb)

Improve lock mechanism

Add Range type