Adding --socket parameter to bin/purge_relay_logs

It's sometimes needed when using multiply instances and socket connection (instead TCP).
Merge pull request #10 from deniszh/master

Adding --socket parameter to bin/purge_relay_logs
Add --defaults_file flag to bin/purge_relay_logs.

Avoid the need to pass passwords on the commandline when the DSN
supports loading config files.
Merge pull request #11 from mediatemple/feature/defaults_file

Add --defaults_file flag to bin/purge_relay_logs.
Formatting
Merge branch 'master' of github.com:yoshinorim/mha4mysql-node
Formatting
Rewrite a shebang line of each bin/* scripts if REWRITE_SHEBANG is set

ExtUtils::MakeMaker rewirtes #/usr/bin/perl or #!perl but NOT
#!/usr/bin/env perl, so mandatorily rewrite shebang if environment variable
REWRITE_SHEBANG is set.

- https://github.com/Perl-Toolchain-Gang/ExtUtils-MakeMaker/issues/58
Merge pull request #12 from hirose31/feature/rewrite-shebang

Rewrite a shebang line of each bin/* scripts if REWRITE_SHEBANG is set
Releasing 0.56
Create/delete test table with MyISAM engine instead of InnoDB

...for preventing inoodb_pool locks.
Fixes #14.
Merge pull request #15 from deniszh/apply_diff_relay_logs_test

Create/delete test table with MyISAM engine instead of InnoDB