Updated README

With MySQL 5.6 default configuration is more strict and adds STRICT_TRANS_TABLES.

Added some info to configure MySQL properly. Better solution would be to make the schema correctly, defining optional columns as nullable.
One little modification on formatting
Merge branch 'master' into doc-mysql56

Conflicts:
	Readme.md
Merge pull request #381 from moustikAir/doc-mysql56

MySQL 5.6 default config creates bug