Customize openshift logo and name

We wanted to make openshift's logo and name settable via console.conf. Here are the changes:
console_helper.rb
	- replace hard-coded value of openshift logo and product title by dynamic values from  	Console.config

configuration.rb:
	- add support of OPENSHIFT_LOGO and OPENSHIFT_INSTANCE_NAME parameters

console.conf:
	- add OPENSHIFT_LOGO and OPENSHIFT_INSTANCE_NAME parameters