Updating version to RC2 snapshot.
SES-87

Improved support for load balancers and reverse proxies. New context provider (SAMLContextProviderLB) is available and allows overriding of local values with settings from the load balancers. This solves e.g. issue with comparison of local endpoints which differ between load balancer and local machine.

SAMLContextProviderImpl contains the following changes:
- HttpServletResponseAdapter now sets it's secure parameter based on the request object.
- Method for loading of context based on entityId was removed and replaced with passing of the entityId through request object

Both SAMLEntryPoint and SAMLDiscovery now use SAMLContext to load current contextPath, which enables it's overriding based on load balancer public value. SAMLDiscovery contains method signature changes.
Separated local and peer entityId request attributes.
SES-83 Documentation update