Merge pull request #4 from simpleinvoices/master

Merged issue #55 fix from simpleinvoices/simpleinvoices
Recommended DB Creation statement during install added.
Fixed Customer Edit when Credit Card Number is not changed.
Error was introduced in:
http://github.com/apmuthu/simpleinvoices/commit/d167997563c6f55680f4beefcf3631d450f2bc62
Reverted utf8 charset and utf8_unicode_ci collation in databases/mysql/structure.sql
This is being done to override any mess in database creation that may have been done.
Merge pull request #64 from apmuthu/master

AP merge - re utf8 in db and credit card fix