Add synced folder of concrete5
Use constants for configuration
Add hostname and private network IP
Add concrete5 Japanese edition
Merged @ixkaito commit.
And rewrite the instruction for the change

Thanks!

@ixkaito さんの修正をマージし、その際に変更になった部分の Readme を修正しました。ありがとうございます。

Merge branch 'master' of github.com:miya0001/vagrant-concrete5

# By KITE
# Via KITE
* 'master' of github.com:miya0001/vagrant-concrete5:
  Add concrete5 Japanese edition
  Add hostname and private network IP
  Use constants for configuration
  Add synced folder of concrete5

Conflicts:
	Vagrantfile