Added some lemmas on the interaction of ap with application and lambda.
Added a special nondependent case for transport_forall.
Added some lemmas.
Added lemmas.Merge branch 'master' of https://github.com/HoTT/HoTT
use symmetric_paths as the correct reference
no, inverse is a better reference
Changing names of Kristina's pull request
Merge pull request #107 from DanGrayson/master

fix a reference better
Merge pull request #108 from andrejbauer/master

Kristina's pull request with changed names