Adding documentation for time checks.
Adding missing check for issueInstant in artifact resolution profile.
Minor improvements to error messages.
CredentialsException is now only used for time errors in AuthnStatement. Changed exception in ArtifactResolution. Documentation update.
SES-139 Adding support for hostname verification in artifact resolution.
Updating to OpenSAML 2.6.1
Documentation proofreading
Adding new contributor.
completed backporting to function with spring-security 2.0.7 as necessary to function with jasperserver.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	saml2-core/pom.xml
Merge remote-tracking branch 'upstream/master'

Conflicts:
	saml2-core/pom.xml
Merge origin/master