Support expressions to check 'realms'.

Expression-Support for 'realm'

This release bring support for realm-checks in expressions. An example can be seen here. For configuration have look at this line.

You can now define expressions like:

• #oauth2.hasRealm('/customrealm')
• #oauth2.hasAnyRealm('/customrealm','nextCustomRealm','howManyRealmsDoYouHaveMan')

You are also able to combine them:

• (#oauth2.hasRealm('/customrealm') && #oauth2.hasScope('uid'))
• (#oauth2.hasScope('uid') && #oauth2.hasAnyRealm('/customrealm','nextCustomRealm','howManyRealmsDoYouHaveMan'))

But to make the last expression a bit shorter, we also provide something like

• #oauth2.hasUidScopeAndRealm('/customrealm')
• #oauth2.hasUidScopeAndAnyRealm('/customrealm','nextCustomRealm','howManyRealmsDoYouHaveMan')

PR's merged

• #24 thanks to Lukas Niemeier
• #22 see above for description
• #21 'choose request-factory by dependencies in classpath'

Thanks to all for reporting issues and PR's.