Merge branch 'upstream/master'
 - define the TGT cookie lifetime more percisely in the CAS 3.0 specification (for non-LT and LT).
 - fixed typo in 3.0 spec, created pdf / html
Merge pull request #402 from robertoschwald/master

CAS 3 Spec: more precise lifetime definition for normal- and Long Term support TGT/TGC