Modify handling of `bodystmt`.
Modify handling of OP_ENTER.

If `argc` is `-1`, `block` parameter is sometimes overwritten.
Add test for issue #750.
Modify handling of Quoted non-expanded literal strings.
Add a test for quoted non-expanded string literal.
Modify handling of NODE_UNDEF to accept multiple arguments.
Add test for `undef` and `alias`.
Improved build scripts and config files
Merge pull request #751 from masamitsu-murase/modify_block_copy_of_op_enter

Modify handling of OP_ENTER.
Merge pull request #749 from masamitsu-murase/modify_handling_of_bodystmt

Modify handling of `bodystmt`.
Merge pull request #753 from masamitsu-murase/modify_handling_of_quoted_string_literal

Modify handling of quoted non-expanded string literal
Merge pull request #754 from masamitsu-murase/modify_undef_node

Modify handling of NODE_UNDEF.
Merge pull request #755 from masuidrive/imprive_build_scripts

Improved build scripts and config files
Fix Visual Studio Toolchain
Reduce line length
make minirake respect verbose and set verbose to false by default
Set default rake to not verbose
Beautify the output of rake
Merge pull request #761 from bovi/beautify-build

Beautify build process output