Added Naira to Available Currency

Naira is the official currency of Nigeria. A lot of stores are powered
by WC in Nigeria. This commit add the Naira currency and symbol to WC
Added Naira to Available Currency

Naira is the official currency of Nigeria. A lot of stores are powered
by WC in Nigeria. This commit add the Naira currency and symbol to WC
#4533
Merge branch 'master' of https://github.com/tubiz/woocommerce
Merge pull request #4534 from tubiz/master

Add Naira Currency and Symbol to Woocommerce