Remove unused variable

Why
----

This commit removes the following interpreter warning.

* warning: assigned but unused variable

Reproduction
------------

* ruby 1.9.3p392 (2013-02-22 revision 39386)
* `$VERBOSE = true` on test
Remove unused variable and definitions in test

Why
----

This commit removes the following interpreter warning.

* warning: assigned but unused variable

Reproduction
------------

* ruby 1.9.3p392 (2013-02-22 revision 39386)
* `$VERBOSE = true` on test
Fix indent in test

Why
----

This commit removes the following interpreter warning.

* warning: mismatched indentations...

Reproduction
------------

* ruby 1.9.3p392 (2013-02-22 revision 39386)
* `$VERBOSE = true` on test
Rename conflict variable with the following block

Why
----

This commit removes the following interpreter warning.

* warning: shadowing outer local variable

Reproduction
------------

* ruby 1.9.3p392 (2013-02-22 revision 39386)
* `$VERBOSE = true` on test
Merge pull request #50 from kachick/improve-remove_warnings

Remove some interpreter warnings