Update README.ja.md

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Update README.ja.md
Update README.ja.md

change "必須" to "必要"
Update README.ja.md
Update README.ja.md
Merge pull request #160 from t-cyrill/master

Better translation README.ja.md
Add path checking before loading the phpbrew function.
check directories
write phpbrew rc file to $home
Checking in changes prior to tagging of version 1.11.7.
Remove and purge from $PHPBREW_ROOT not $PHPBREW_HOME
Delete composer.lock
Checking in changes prior to tagging of version 1.11.8.
allow variants inheritance
move the variant inheritance option from the variants list to an option to the install command and rename it to like